What you have is a Deluxe grade that was made from 1940 to 1950.I assume the side panels on the stock are checkered. The reason its not stamped on the bottom is because of the engraving. Rounded frames were an extra on the Deluxe. The Deluxe grade replaced the Trap grade in 1940. The only difference in the two is the forend checkering. The Trap had the kidney pattern and the Deluxe had the Custom pattern. Both had the side panels checkered. They were available in 12, 16 and 20ga. The Customs did not have wording on the barrels so I assume the deluxe didn't either. After 1940 the trap gun became a type of gun not a grade also at that time the Custom Grade was dropped and then reinstated in 1950 when the Deluxe was dropped.