I would like to see other views of the butt plate because this butt plate does not appear to have the same profile as the N.R.A. Sporter or the Pacific-made brass or aluminum butt plates.
I have not seen evidence that Pacific made an 03 non-Ferris butt plate with a trap.
I have two 1903 aluminum service-type butt plates with trap - one ismarked HILL and the other was made by James V. Howe.
Most of the aluminum & brass 1903 after-market butt plates that I have seen are not marked by the maker.

Gary Bush