Sinn 104 Panda / 451-33 manual winding watch in 38.5 mm (measured without crown) from the 1970s, the early days of Sinn. Reference number: 104 / 451-33 Age of the watch: approx. 1970 to 1980 Newly serviced on January 13, 2026! Service guarantee until January 13, 2028! Rare Sinn 451-33, also known as "104 Panda." This watch was manufactured in the 1970s, the early days of the Sinn company, by Helmut Sinn for "Rhein Flugzeugbau GmbH." The company used these watches as anniversary gifts for long-standing employees, with the corresponding year engraved on the back (I have seen versions for 10, 12, 15, and 20 years). Beautifully preserved silver Panda tritium dial with tritium hands. In January 2026, the Sinn underwent a comprehensive service including replacement of wear parts for around €411. The watch was completely disassembled for this purpose, see photos. Invoice is included. The watch has a 24-month overhaul warranty from January 13, 2026, i.e., until January 13, 2028. A certificate of accuracy is included, as are the parts replaced during the overhaul (including mainspring, seals, balance wheel). The watch comes in the original Sinn travel/service case. A matching neutral leather strap with original Sinn buckle is attached to the watch. The 104 Panda is powered by the high-quality Valjoux 7733 manual winding movement. Despite being well over 50 years old, the watch still measures a more than contemporary 38.5 mm, which makes it look perfect on the wrist. Beautiful condition with only slight signs of wear and scratches; the original sunburst finish is still clearly visible. In our test on the timing machine, the watch ran very well at around +9 s/d with an amplitude of 280 degrees. All functions are flawless, the chronograph resets cleanly, and the reset works perfectly. The measured power reserve is around 47 hours. All watches are in stock, so please contact us in good time if you would like to view them. You will, of course, receive a proper invoice for your watch.