behind the gear shifter on the transmission cover
But not always. I have looked on several which had the brass plates missing and no stamp showing where Jeff indicates. I think some were stamped and others not. I stand to be corrected but that is my experience.
JanM
some times on top of the flywheel cover the older 30's had the snakepit exhaust manifold and the small track recoil springs some times a casting date
behind the gear shifter on the transmission cover
Jail this be a serial number or a date stamp can you post a picture of where it is I’ve found a number behind back cylinder looks to be a date