Stripped saavge #4 receiver with a”T”

[Olddust]

Hi all,
I posted this in another forum several months ago. I have a stripped Savage No4 action. It has a lone T near the trigger guard cross screw. There are no mounting holes or milled areas for scope pads, action is 1942 27C series. The only other thing I can see different from all the others I have seen are the two “W” marks on the action body
Any chance of a special piece here ?

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