Mentor Constellation Jump Hour / Digital – Swiss Vintage Mechanical Watch (1970s) Offered here is a rare and collectible Mentor Constellation Jump Hour (Digital) men’s wristwatch, produced in Switzerland in the 1970s, a period known for bold and innovative watch designs. This model features the distinctive jump hour (digital) display, a complication that became especially popular during that era. Condition & Service The watch has been fully serviced by a professional watchmaker. The movement was completely disassembled, cleaned, lubricated, and adjusted. The last photo shows the watch in disassembled condition during servicing, confirming the quality and authenticity of the work. The watch is running correctly and keeps time as expected for a vintage mechanical piece. Key Specifications Brand: Mentor Model: Constellation Jump Hour / Digital Movement: Mechanical, manual winding Caliber: Baumgartner BF 582 Jewels: 17 jewels Country of origin: Switzerland Case Material: Stainless steel with chrome-plated finish Width: Approx. 36.3 mm (excluding crown) Vintage cushion-shaped case typical of 1970s design Dial Color: Deep blue Display: Digital jump hour with analog minute and second indication Clean, well-preserved dial with strong vintage character Strap Type: Modern replacement strap (not original) Material: Two-tone rubber Comfortable and suitable for daily wear Collector’s Note Jump hour watches are increasingly sought after by collectors due to their mechanical complexity and unmistakable retro appeal. The Mentor Constellation is a fine example of Swiss innovation from the 1970s and represents an excellent opportunity for both collectors and enthusiasts of unusual mechanical watches.