Looking For Help to Identify Carrier Please and Thank You

[Seatyger]

Hello Guys;

My Son and I have started to scrape off some rust and get into the initial clean up process. I want to say thanks to those that gave me the Heads Up where to find the Identification Numbers.

The Numbers stamped into the metal in front of the Driver (For lack of the proper descriptor) were as follows from Left to Right-

CT 115075 S O (or 0) 1942 9503 (Then a 2 and 1 laying over horizontally to the right)

Thats is all I could see after some minir scuffing with a 3M Pad. I will bring some white-out to try and make them more legible.

On the angle iron behind the Gunner's Head was stamped CP 1636.

I have been digging through Nigel's Books but can't seem to locate that serial Number range.