The Grand American and Pigeon Grades are post 1959 grades. Guns of similar specifications, with rounded frames, were made throughout production, but are rare. Everything made post 1959 had the rounded frame, with all degrees of decoration, from no engraving to very elaborate engraving. The bluepike.tripod.com Model 21 website is still available, even though the webmaster has declared it closed. That is your best chance at learning about Model 21s of all eras. You can look at the pages of the post 1959 catalogs and others as well. My unique Model 21 Salesman's Portfolio is also pictured.