what is proper for an American classic is what was originally put on it when built, whatever level of polish that might be.
SRH
Stan is correct here......some guns came with a higher polish and some came with less polish, usually depending on their original cost and grade level.......
Most of us that re-blue-black barrels commonly do both high gloss and satin finishes........A.) What does the customer want...?..B.) What finish did the gun leave the factory with...?..
The higher the polish and preparation, the higher the gloss as Leighton has mentioned above and the higher the cost........
It's not rocket science gents........