A pre-WWII style buttplate with the round logo, it is slightly curved and has an extension at the top of the buttplate that protrudes into the stock.
Measuring back side of buttplate
5 1/16” x 1 11/16”
3 3/8” between screw holes (c/c)
9/32” from heel to center of top screw hole
1 7/16” wide across center of screw hole @ toe