The steel Apollo 11 works, too, Abel . . .
. . . and thanks for volunteering - the more, the better!
Start by giving the Speedmaster a full wind set precisely to an atomic clock, then wind it once per day. At night, take it off your wrist and place it dial up. Same the second night but dial down.
At the end of ten days, report the difference in time in this thread.
One additional request: can you moderate this thread for the next few days? I'll be away from home and without access to my computer until Monday.