Bob, most of this is covered in 1955 and earlier large size catalogs. Round and straight wall receivers are restricted to Deluxe and Custom Built grade guns. These guns can also be identified from across the room, if in original finish, by their polishing and high gloss blue finish. Skeet and Trap finish guns usually exhibit better polishing than Field Grade guns, but it is not easy to identify unless the gun is new and unused. Custom stock dimensions were no cost with Custom Built and Deluxe grade guns, small extra cost with lower grades. Wood quality was a tossup in the lower grades.
