There are only two possibilities here since saddle has small rivets and not the larger ones in copper. So it will be either a B17 Standard or B17 Narrow.
Nowadays they both come with black painted steel frame and not the silver one as seen here. Unfortunately, it is impossible to tell whether it is one or the other just looking at the pictures, but OP can clear that up easily as the B17 Standard is 6 3/4" wide whereas B17 Narrow is only 6" wide.
GLWS
Steen