Calling all T206 Back (Stamp/Wet Sheet) Experts

[DixieBaseball]

Guys,
Please take a look at the back of this T206 and let me know your thoughts. It appears there is a 3 and another number with a straight/dotted line on the reverse bottom. Does anyone know what this is or how it might have happened? I know we have several folks on the board that love this stuff, and I would just be curious what the experts thoughts are on how that number got there? It doesn't appear applied post date, but something that has been there since produced. I will hang up and listen...
Thank you,
J

[Jobu]

It looks to me like a weakly, unevenly inked rubber stamp. There appears to be a word with "ff" and perhaps ending in "n" across the factory number too.

[mrvster]

the same thing rubber stamp

[DixieBaseball]

Thanks guys for the input.

[Howe’s Hunter]

if you have any other back stamps you would like to have more closely looked at or analyzed, you can send them to me. Especially Southern League Hindu-backed T206s.

Haha.