I have two seemingly identical potentiometers, except for a slight difference in labeling. The p103, I understand, means they are 10k potentiometers, however I have been completely unable to find the meaning of the 520B and 122C labels. What do those mean? What if any, are the differences between these?

 

Probably batch/date codes.
The manufacturers data sheet may tell you just what they mean.

 

Welcome to AAC!

It's probably a date code.

Cropped picture. Couldn't do anything about focus...

 

Welcome to AAC!

It's probably a date code.

Cropped picture. Couldn't do anything about focus...

View attachment 213861

Yeah, sorry, my camera didn’t like that. Top says p103 on both.
bottom is inverted for some reason and says 520 B on the left and 122 C on the right.

 

my camera didn’t like that

A smaller aperture would increase depth of field. I usually set my camera to F16 when I want more things to be in focus.

 

Yep date or batch code.

 

B linear
C inverted log
A log

 

I've seen that on standard pots as the prefix (IE B105) but my mini pots have all kinds of letters and 3 digits upside down under the P XXX designator. Also my multiturn trim pots have the same upside-down codes. I don't think I ever encountered a log mini? Not that I recall at least but that's not saying much with my memory these days. FWIW

 

Welcome to AAC!

It's probably a date code.

Cropped picture. Couldn't do anything about focus...

View attachment 213861

Probably a manufacturing code, but it may identify a specific functionality. Check the part number on data sheet.