This is one of only 691 manufactured in 1933. Flawless never fired. 30 inch barrels. 12 gage.
These early guns were "velocity proofed" by Winchester. Each gun was fired a number of times with shells that were 50% higher loads than those available at the time. Winchester originally tested a 21 against the best English side by sides (Purdey's, Holland and Holland's, etc.) with the idea of firing each gun until failure with these VP loads. Every English gun failed after a few hundred rounds. The 21 kept firing until they just gave up trying to defeat it after 2,000 consecutive rounds.