The B.F. on your bolt is for Bonney Forge & Tool. I believe Springfield Armory finished these bolts from forgings, supplied by Bonney Forge, during WW2.

(I don't know the significance of the numbers stamped and scribed on your bolt. Maybe, it was 'matched' to the serial number of another 1903 at one time)?

The 'C' on the bottom of the bolt-handle root is probably a steel lot I.D.

My 1935 vintage, 1903 Springfield, had a Remington bolt when I got the rifle. I replaced it with a new 'H.O.' (Hoover Bearing) bolt, made during WW2. The finish matched my rifle and 'head-space' was spot on.

This rifle I 'restored' to be a good looking 'Shooter'. I was not worried about 'collector' perfection. I was not going to invest $175 for a N.S. marked bolt. My rifle also lacks the 'Hatcher Hole'.

There is enjoyment in having a good looking parts gun and you don't feel guilty shooting it.