Wait, I think I misread your original message...
The "F" markings...
Are they visible when the gun is assembled?
Savage DID apparently stamp model designations on hidden parts of the wood forearm and/or stock at various points in time, apparently so they could keep the stocks straight during the manufacturing process.
But, as I noted, Savage did not mark the rifles with a model letter designation in a visible spot on the receiver until after World War II.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.