A833 Transmission Stamp

[gyxffyg]

Has anyone seen a stamp like this on an A833 4 speed transmission? The pad where it is stamped is not smooth like all others that I have seen as you can see from this picture.
Also all that is stamped is PP833 4116 which is the date code of November 3, 1972.
No other numbers are present. There should be a sequence assembly number and the vehicle serial number.
Thanks

 

[gyxffyg]

The only suggestion that I have found for what this stamp means has been a factory warranty replacement transmission. I have not found any document on the web telling what it means though. Just in case anyone was wondering.

 

[BlueDream]

Seems like a reasonable explanation to me. Never seen that before. Thanks for sharing!