I am not an expert on Model 21, so maybe one of you could answer a question. Some decades ago, I picked up a Model 21, 16 ga, marked Skeet in front of the trigger guard. Chokes marked WS1 and 2. Now that I have seen a few more things , Winchester 21 wise, I think the obviously factory stocks were odd. They were English walnut, while most I see are American black walnut. Is the English walnut uncommon ?