Dr No[Moderator Omega - Wristscan]
37614
By all reports the cal 9300 movement in your Speedmaster . . .
. . . is a consummate performer. Bulletproof and accurate over the long term, too.
My pal's earlier GMT Speedmaster - some twelve years old now - is only beginning to show its age. I'll wager yours will perform similarly well for a decade or longer.
Art