Welcome to the forum! There isn't a model letter, but there was only one model made with a schnabel at the time yours was made. It's a model 99EG, probably made in 1954. I'm guessing it's also drilled and tapped for a scope, with the Savage 99 on the front top of the receiver stamped to the side?
Very nice rifle, keep hold of that one. I hunt with a 99EG in 300, and they are a great deer rifle.
