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Can anyone tell me where (if there even is one) the serial number on a Standard AA is located?

I have the Standard AA and Columbia AU. I was wondering about the serial number myself.
Harvey Kravitz

Here is my Standard AA open works and the serial number is located at the bottom of the frame directly under the crank.

Rich Gordon

I will have to check that spot. I looked at the thing for 20 minutes, I can't imagine I missed something so obvious. Maybe someone switched the plates around or something and the serial is on the inner one now?

Stay tuned...

I haven't owned a Standard AA for 25 years, but I seem to remember the serial number of mine being stamped on the upper edge of one of the motor plates - in late Q fashion. On the other hand, I may be crazy...

George P.

i'll have to check my machines. I didn't realize such an obvious place!!
Harvey Kravitz

The search continues...

Does this mean I'm crazy?

George P.

I've been meaning to tear this machine down and polish everything for a while. I would imagine that somewhere on one of the greasy motor plates is a serial number coated in crud.

On my AA, the serial number is stamped on the front edge of the center plate adjacent to the spring. A little mangled, but reads 217841. Interesting that locations vary.
Rob