You have a good question. I have seen two 20 ga 21s that were marked skeet and had 28" M&F barrels on them. They could have been two barrel sets in which case the choked barrels would have a 2 on the forend lug.
What most people don't know is that skeet was never a grade of gun only a type of gun and there fore there is no reason for these guns.Before 1940 if you wanted somthing better than a standard skeet gun you ordered a tournament grade, trap grade or custom grade and after 1940 these were replaced with the deluxe grade and the trap, duck,skeet and field became types of guns.
So you have a good question.However it doesn't hurt the value of the gun.
AC
