That's the transom housing serial number the outdrive serial is located by the vent plug on the upper housing- just below it. It will be not only in the sticker but also stamped in the metal is the sticker is gone or damaged.
ok thanks guys.
1 more question. most people on here says to pull the drive every year to do Maint. i took my outdrive off last year because we pulled the motor to have it rebuilt.
does that mean you put new bell house gasket and o-rings every time or are they reusable