The stopwatch was used by Scott to provide a redundancy for controlling the operating time of the descent of the Lunar Module, specified to 24 seconds with a tolerance of only 0.3 second. Scott considered that the dial of his Bulova was easier to read in operation than the Omega instrument. It passed with an estimate of $ 120K at Bonhams on May 5, 2011.
The other instrument is a more classic chronograph that Scott carried on his wrist in the third and final moonwalk of the mission. The most spectacular feature of Apollo 15 was the first use of a motor vehicle on the moon, the Lunar Rover. In this tour that departed the astronauts up to 5 Km from the LM, an error in assessing the time could have caused a fatal lack of oxygen or of battery power.
This piece of equipment escaping the official mission is the only watch in private hands that has been used on the surface of the moon. It will be sold on October 22 in Boston by RR Auction, lot 9001. Here is the link to the post issued by the auction house.
SOLD for $ 1.62M including premium