3197.50.00Ref

Reference 3197.50.00 is a limited edition of seven yellow gold Speedmaster watches that collectively spent 365 days aboard the MIR space station before being sold in 1995. Of these, only two had the gold bracelet, while 28 stainless steel Speedmasters received the same treatment. The caseback is engraved with '365 DAYS ON BOARD SPACE STATION MIR' and 'JULY 1993 - JULY 1994'; limited to 7 units.