Alpha pot codes?

[EFK]

Can anyone tell me what the ink stamped numbers on the back of Alpha pots represent? They are the only markings on the pots that I can see and all the pots in the amp are one of the following codes:

5N4
6G1
6E2

Can you determine value/taper type from these?

[Enzo]

Those look like date codes or lot codes to me.

You sure there is not more information printed around the sides, or even stamped on the front side?

[EFK]

Didn;'t see anything at all on the sides. Will pop one out and take a look at the front - thanks!