Here`s my take,
I see the finnish as black over gold and then the black pulled off. One of the things they pulled off the paint with looks in the photo to be a seven or upsidedown L, either way, it strikes the shell at the same angle and pulls basically the same amount of paint off.
I think the paint on the finnished BD shell looks more Professionally done by factory or pro shop to be home done !! I see ludwig doing that for a customer !!