Grovana Vintage "Jump Hour" Sub-Second . A fascinating and highly collectible piece of 1970s horological history, this vintage Grovana "Jump Hour" watch offers a captivating mechanical interpretation of a digital display. Breaking away from traditional hands, this unique complication utilizes internal rotating discs to reveal the hours and minutes through dedicated apertures on the dial. The hour disc "jumps" forward instantly at the top of the hour, a complex mechanical feat that remains incredibly satisfying to witness. Complemented by a classic sub-second register, this dial layout creates a striking, avant-garde aesthetic that perfectly captures the innovative, space-age spirit of its era. This Swiss-made timepiece is not just a watch; it is a conversation starter and a highly sought-after mechanical curiosity for the serious collector. . Important Note: High-resolution images may exaggerate minor imperfections or light surface scratches on the case and crystal not visible to the naked eye. . Specifications . Brand: Grovana . Model: Vintage Jump Hour Sub-Second . Movement: Swiss Mechanical Winding . Case Material: [Stainless Steel / Chromed ] . Case Size: 38mm (without crown) . Dial: Original dial featuring Jump Hour window, Minute window/track, and Sub-Seconds register . Crystal: Acrylic (Plexiglass) . Strap: New leather strap . Functions: Jump Hour, Minutes, and Small Seconds . Gender: Men / Unisex . Era: 1970s . Condition . Overall: Excellent vintage condition. The watch possesses an incredibly unique and historically significant aesthetic. . Movement: The Swiss mechanical movement is in strong working order. The "jump" mechanism functions correctly, snapping precisely as the hour changes. . Case: The case is well-preserved, maintaining its structural integrity and unique geometric lines with honest signs of vintage wear. . Dial: The dial and the rotating numerical discs are in superb condition, offering an incredibly clean and legible layout. . Tax Disclaimer . VAT, customs duties, or import taxes may apply depending on the buyer’s country. Please check local regulations before bidding. . Shipping . Worldwide insured shipping with tracking. The watch will be carefully packed for safe delivery via express courier.