A-Body axle stamps

I am about to have some stamps made for the various markings on my 8.75 housing ('70 Swinger, 340 3.23 SG), and two in the pic below have me confused. They are located between the center section and the spring perch. Does anyone know what they are? It looks like TSA (or maybe T8A), and below that 193T.

Thanks.

The 2 rears I posted here are 70-72 because of the vent location:


https://board.moparts.org/ubbthreads/ubbt...axle-stamp.html

Thanks. I should clarify that the marks shown in my original post are in addition to the other "typical" marks found on an 8.75. The housing has a very clear date code stamp of 9-27 near the driver-side spring perch (the car is a treasure-trove of well-preserved inspection marks). So what ever the above marks are they would not appear to be the date code.

Is it an LA built car?

On a survivor-ish LA built So-Cal driven 340 Demon, I’ve seen actual small stamping impressions on center section.

I gotta dig up those pics.

It's a Windsor-built car.