Seiko quartz chronograph, calibre 8T63, reference 8T63-00D0, running – dark green sunburst dial with gold-coloured markers and hands, 30-minute, 24-hour and small-seconds registers, date at 4.30, tachymeter bezel, 10 bar, stainless steel case, on a Seiko calf leather strap with Seiko deployant clasp, with Seiko box. PLEASE NOTE: the leather strap is heavily worn. The strap is a genuine Seiko calf strap, marked SEIKO CALF on the back with the width 20, but the crocodile-grain surface on the 12 o'clock side has rubbed pale and smooth where the strap passes through the keeper, the edge finish is lifting beside the stitching, the floating keeper is cracked and whitened, and the third hole is stretched oval from regular use. The strap is included as it came, but a buyer who intends to wear the watch should budget for a new strap. The Seiko deployant clasp is in good order. The polished bezel carries a concentration of rubs and scratches between the 1 and 2 o'clock positions, over the TACHYMETER lettering and the 400 graduation, and fine hairlines elsewhere; these are described under Condition below. Together with the worn strap, this is the reason the watch is graded Good rather than Very good. A fine straight line near the 10 to 11 o'clock markers and a faint curved smear near 11 o'clock appear in two photographs taken at different angles but not in the same place, so they have not been established as scratches on the crystal; they are noted under Condition below. Two tiny red-brown points in the groove between the bezel and the case, and a brown mark on the inner frame of the deployant clasp, have not been established as dirt or as pin-point rust. The year of manufacture cannot be fixed exactly from the serial number, which encodes only the last digit of the year: 2D reads as December of a year ending in 2, and because the 8T63 calibre was introduced after 2012, this is read as December 2022; the period entered in the listing fields follows this reading. Only the Seiko box is included: there are no papers, no warranty card and no instruction booklet, so the Japanese catalogue number of this model has not been confirmed and the watch is listed under its case reference. The code printed at the foot of the dial reads 8T63-00G8 and differs from the case code 8T63-00D0 engraved on the caseback: on Seiko watches the dial code identifies the dial and the case code identifies the case, so the two are not expected to match and the difference is not a sign of a replaced part. The caseback is marked MOVEMENT JAPAN and CASED IN CHINA. It is also marked WATER RESISTANT 10 BAR, but the gaskets have not been tested, so the water resistance is not guaranteed and the watch should be kept away from water. The crystal is not marked as sapphire anywhere, so no claim is made about its material. The chronograph hands sit correctly at zero, but the start, stop and reset functions have not been operated. The case diameter has been measured with a caliper at 40 mm; the lug width is taken from the 20 stamped on the strap. Overview A Seiko quartz chronograph on the 8T63 calibre in polished stainless steel with a dark green sunburst dial and gold-coloured furniture, a combination offered in Seiko's Japanese domestic range. The dial is a deep green – measured off the photographs at a hue of 143 to 166 degrees, strongly saturated in the dark areas and lighter where the sunburst catches the light – with gold-coloured applied bar markers, doubled at 12, each with a white luminous point at its outer end, the gold-coloured applied SEIKO and CHRONOGRAPH below 12, and three gold-ringed registers: a 30-minute counter at 9, a 24-hour indicator at 3 and the running seconds at 6, all with gold-coloured hands. The hour and minute hands are gold-coloured with white luminous inlays and the central chronograph seconds hand is gold-coloured too. The date sits at the 4.30 position, white on black. The fixed polished bezel carries a tachymeter scale in black from 60 to 500, and the crown and the two pushers are plain polished steel. The case, crown, pushers and bezel are stainless steel with no gold plating; the gold colour is confined to the dial. The watch comes on a dark brown Seiko calf strap with a Seiko push-button deployant clasp, and the Seiko box is included. Specifications - Brand: Seiko - Model: Chronograph, Seiko Japanese domestic range; the catalogue number has not been confirmed – see the note above - Reference number: 8T63-00D0, engraved on the caseback - Serial number: 2D4070, engraved on the caseback - Movement: quartz chronograph, Seiko calibre 8T63, with 30-minute counter, small seconds, 24-hour indicator, 1/5-second central chronograph hand and date - Date of manufacture: December 2022 per the serial number under Seiko's dating convention – see the note above - Case: polished stainless steel with a fixed polished bezel printed with a tachymeter scale from 60 to 500 and the word TACHYMETER, a grooved steel crown at 3 and two cylindrical steel pushers at 2 and 4. Solid caseback engraved SEIKO / 2D4070 / WATER RESISTANT 10 BAR / MOVEMENT JAPAN / CASED IN CHINA / STAINLESS STEEL / 8T63-00D0, with two small inspection marks. No sticker. No plating and no precious-metal hallmark anywhere. - Case diameter: 40 mm excluding the crown - Crystal: flat, with no chips or cracks. Two faint marks seen in the photographs have not been established as scratches – see the note above. The material is not marked anywhere. - Dial: dark green with a sunburst finish. Measured off the photographs with the background in the same frame used to correct the white balance, the dial reads at a hue of 143 to 166 degrees, a saturation of 96 to 97 per cent in the dark areas and 33 to 38 per cent where the sunburst catches the light, and a brightness of 17 to 26 per cent, so a deep, clearly green dial rather than black. - Dial printing: gold-coloured applied SEIKO and printed CHRONOGRAPH below 12; MOV'T JAPAN and the dial code 8T63-00G8 at the foot of the dial - Registers: 30-minute counter at 9 o'clock marked MIN. 30; 24-hour indicator at 3 o'clock marked 6, 12, 18 and 24; running seconds at 6 o'clock marked 20, 40 and 60, each with a gold-coloured ring and a gold-coloured hand - Markers: gold-coloured applied bar markers, doubled at 12, each with a white luminous point at the outer end - Hands: gold-coloured hour and minute hands with white luminous inlays, a slim gold-coloured central chronograph seconds hand and gold-coloured register hands. Whether the luminous material still glows has not been tested. - Date: window at the 4.30 position, black disc with white numerals. There is no day – this is a date-only model. - Bezel: fixed polished stainless steel bezel with a tachymeter scale in black - Water resistance: 10 bar per the caseback, but the gaskets have not been tested – see the note above - Strap: Seiko dark brown crocodile-grain calf strap, marked SEIKO CALF on the back of the long side and L0FR B 20 on the back of the short side, with one fixed and one floating keeper, on a Seiko stainless steel push-button deployant clasp engraved SEIKO on the cover and STAINLESS STEEL inside. About ten holes. Heavily worn – see the note above. Whether the strap was supplied with the watch when new or fitted later as a Seiko accessory is not known. - Lug width: 20 mm, per the stamp on the strap - Wearable size: on the graduated cone in the photographs the strap was fastened at about 185 to 190 mm; the holes allow a range of a few centimetres either way. - Weight: 82.00 g - Included: the Seiko box. No papers – see the note above. Condition Good, with visible signs of wear: the polished bezel is scratched and the strap is heavily worn. - Dial: excellent. No stains, no crazing, no discolouration and no lifting of the markers were found under magnification, and the printing is sharp. A tiny white point near the 20 of the 3 o'clock register appears in one photograph only and is most likely dust on the crystal. - Markers: all present, firmly seated and free of corrosion. The luminous points are complete. - Crystal: no chips or cracks. A fine straight line near 10 to 11 o'clock and a faint curved smear near 11 o'clock appear in different photographs at different places and have not been established as scratches – see the note above. - Hands: all six straight and clean, with no corrosion. - Case and bezel: a concentration of rubs and scratches on the bezel between 1 and 2 o'clock, over the TACHYMETER lettering and the 400 graduation, and fine hairlines across the rest of the polished bezel; the tachymeter printing is complete. Fine hairlines on the case sides and the pushers. Two tiny red-brown points in the groove between the bezel and the case, not established as dirt or rust. No dents and no distortion. - Caseback: light marks from normal wear. The engraving is clear. - Crown and pushers: intact and correctly seated, with no chips or deformation. Some dark residue in the grooves of the crown, which appears to be dirt. - Corrosion: no rust and no green corrosion were found on the case, the dial or the hands. For the small brown points, see above. - Strap and clasp: the strap is heavily worn as described in the note above, with the surface rubbed pale and smooth on the 12 o'clock side, the edge finish lifting beside the stitching, the floating keeper cracked and whitened and the third hole stretched oval; the leather is not torn. The deployant clasp opens and closes correctly; a brown mark on its inner frame has not been established as dirt or rust. - Box: the Seiko box shows no crushing or marked soiling in the photographs. The inside of the box has not been photographed. Working order The watch is running. The small seconds hand at 6 o'clock was checked against the timestamps of six photographs spanning 2 minutes 32 seconds: between each pair of frames it advanced in step with the elapsed time, to within a few seconds of reading error, with no interruption. The central chronograph seconds hand sits at 12, the 30-minute hand at its zero position and the 24-hour hand agrees with the time shown in every frame. The chronograph start, stop and reset functions, the date changeover, the timekeeping accuracy and the water resistance have not been tested with equipment, and the battery's remaining life is unknown; the battery is a consumable part and may need replacing at some point. Included Watch, strap with deployant clasp, and the Seiko box. No papers, warranty card, instruction booklet, tags or other accessories. Shipping Ships from Japan. Registered and insured shipping, mainly via DHL or FedEx. Import duties or taxes may apply depending on the buyer's country. These charges must be paid by the buyer. No weekend shipping as courier pickups are unavailable on Saturdays and Sundays. Please feel free to contact me with any questions before placing your bid.