Seiko 1/100-second quartz chronograph, calibre 7T52, reference 7T52-7A10, 1992, running – white dial with gold-coloured Roman numerals and luminous dots, tachymeter scale, 1/10-second, small-seconds and combined 30-minute and 12-hour registers, date at 3 o'clock, gold-plated bezel, 10 bar, on its original Seiko two-tone bracelet. PLEASE NOTE: the black hour-counter hand in the 6 o'clock register stands a little past its zero mark – about 10 to 15 degrees to the right of the 12 at the top of the register – in every photograph, while the central chronograph seconds hand, the 1/10-second hand and the gold minute-counter hand all sit correctly at zero. The reset has not been operated and the cause has not been established; on this family of calibres a hand that is slightly off its zero can normally be realigned with the hand-position adjustment, but this has not been done. The bezel is gold-plated base metal, as the caseback states – ST.STEEL BASE METAL BEZEL – and the crown, pushers and the two centre rows of the bracelet are likewise gold-coloured plating over base metal, not precious metal; there is no hallmark. There are a few small brown specks on the inner folding plate of the clasp, which have not been established as dirt or as pin-point corrosion. The code printed at the foot of the dial, 7T52-7A1L, differs from the case code 7T52-7A10 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 WATER RESISTANT 10BAR, but the gaskets have never been tested or replaced in more than thirty years, so the watch should be treated as not water resistant and kept away from water. The crystal is not marked as to its material, so no claim is made about it. The case diameter has been measured with a caliper at 38 mm. The lug width has not yet been measured and is given below as an approximation. Overview A Seiko 1/100-second quartz chronograph from the early 1990s, in the dressier two-tone style of the period: a polished stainless steel case with a stepped gold-plated bezel, gold-coloured fluted crown and pushers, and a matte white dial dressed with gold-coloured applied Roman numerals, each hour also marked by a round luminous dot. The dial carries SEIKO, 1/100 and CHRONOGRAPH below 12, a tachymeter scale from 60 to 500 printed round its edge, and three registers edged with fine gold-coloured rings: a 1/10-second counter at 12, the running seconds at 9, and at 6 a double-scaled register with a 30-minute track on the outside and a 12-hour track inside, read by a gold minute hand and a black hour hand. The date sits at 3 o'clock in a gold-coloured frame. The gold-framed sword hands carry white luminous inlays, and the central chronograph seconds hand is gold. The bracelet is the original five-row Seiko bracelet with two gold-coloured centre rows between steel, closing on a push-button clasp with SEIKO on the cover. Specifications - Brand: Seiko - Model: no model or line name appears on the watch; the dial reads SEIKO, 1/100 and CHRONOGRAPH - Reference number: 7T52-7A10, engraved on the caseback - Serial number: 210134, engraved on the caseback - Movement: quartz chronograph, Seiko calibre 7T52, measuring to 1/100 of a second, with 1/10-second counter, 30-minute and 12-hour counters, small seconds and date - Date of manufacture: January 1992 per the serial number under Seiko's dating convention, consistent with the production period of the 7T52 and the style of the watch - Case: polished stainless steel with a stepped gold-plated base-metal bezel, a gold-coloured fluted crown at 3, gold-coloured pushers at 2 and 4 and matching gold-coloured ornaments at 8 and 10. Solid screw-down caseback with notches, engraved SEIKO / ST.STEEL BASE METAL BEZEL / WATER RESISTANT 10BAR / 7T52-7A10 / AB in a box / 210134, with a small Seiko mark. No sticker. No precious metal anywhere – see the note above. - Case diameter: 38 mm excluding the crown - Crystal: flat, with no scratches, chips or cracks found. The material is not marked – see the note above. - Dial: white, matte. Measured off the photographs with the white background in the same frame used to correct the white balance, the dial reads at a saturation of 3 to 5 per cent and a brightness of 86 to 94 per cent across three sample points, so a clean white with no cream or silver cast. - Dial printing and fittings: SEIKO, 1/100 and CHRONOGRAPH below 12; a printed tachymeter scale from 60 to 500 round the edge; gold-coloured rings round the registers; JAPAN and the dial code 7T52-7A1L T2 at the foot of the dial - Registers: 1/10-second counter at 12 o'clock graduated 0 to 9; running seconds at 9 o'clock marked 15, 30, 45 and 60; a combined register at 6 o'clock with a 30-minute scale on the outside and a 12-hour scale inside, with a gold minute hand and a black hour hand - Markers: gold-coloured applied Roman numerals at the hours not taken by the registers, with a round luminous dot at every hour position - Hands: gold-framed sword hour and minute hands with white luminous inlays, a gold central chronograph seconds hand, gold register hands and one black hour-counter hand. The luminous material is a cream-white with no flaking; whether it still glows has not been tested. - Date: window at 3 o'clock with a gold-coloured frame, white disc with black numerals. There is no day – this is a date-only model. - Bezel: fixed, stepped, gold-plated base metal – see the note above - Water resistance: 10 bar per the caseback, but the gaskets have not been tested – see the note above - Bracelet: original Seiko bracelet, five-row design with steel outer rows and two gold-coloured plated centre rows, and a push-button three-fold clasp with SEIKO on the cover. No other maker's name appears anywhere on it. About three micro-adjustment holes. No spare links are included. - Lug width: approximately 18 mm, estimated from the photographs – to be confirmed by measurement - Wearable size: as linked the bracelet fits a wrist of approximately 170 to 175 mm, taken from the graduated cone in the photographs; the micro-adjustment holes allow a few millimetres either way. No spare links are included, so it cannot be lengthened beyond this. - Weight: 93.5 g - Included accessories: none Condition Very good, with minor signs of wear. - Dial: excellent. No stains, no crazing, no yellowing and no lifting of the numerals were found under magnification, and the printing is sharp. The luminous dots are complete. One or two tiny specks near 4 o'clock are most likely dust on the crystal. - Markers: all present, firmly seated and free of corrosion. - Crystal: no scratches, chips or cracks were found. - Hands: all straight and clean, with no corrosion. The black hour-counter hand stands slightly past zero, as described in the note above. - Case and bezel: fine hairlines on the polished steel from normal wear. The gold plating of the bezel, crown and pushers is intact, with no wear through to the base metal found. No dents and no distortion. - Caseback: fine hairlines across the surface and one shallow curved scratch right of centre. The engraving is clear. - Crown and pushers: intact and correctly seated, with the fluting complete and no deformation. - Corrosion: no rust and no green corrosion were found anywhere on the watch, apart from the small brown specks on the inner plate of the clasp noted above, which may be dirt. - Bracelet and clasp: no broken or missing links. Fine scratches on the steel and gold-coloured links and numerous hairlines on the clasp cover from normal wear; the gold plating of the centre rows shows no wear through to the base metal. The clasp closes and latches correctly. Stretch could not be assessed from the photographs. Working order The watch is running. The small seconds hand at 9 o'clock was checked against the timestamps of five photographs spanning 24 seconds: across the intervals of 4, 10, 6 and 4 seconds it advanced by about 4, 10, 6 and 4 seconds respectively, so it is keeping time in one-second steps with no interruption. The central chronograph seconds hand, the 1/10-second hand and the minute-counter hand sit at zero in every frame; the black hour-counter hand stands slightly past zero, as described above, and the reset has not been operated. 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. Please consider this a used quartz watch from the early 1990s; the battery is a consumable part and may need replacing at some point. Included Watch and bracelet only. No box, papers, warranty card, spare links 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. 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