KMPS3  Wt. 135.80gr  2500th Anniversary of Persian Empire” Proof Set SH 1350 (1971), Struck at the Royal Canadian mint. Includes (1) 200 Rials, (1) 100 Rials, (1) 75 Rials, (1) 50 Rials, and (1) 25 Rials issues.  A scarce set, struck in pure silver and heavily melted in the great silver price runup in 1980. Beautifully engraved and heavily frosted, with some light pastel toning, a superb set. Sold along with its original blue plastic folder and papers. I removed the coins from their soft plastic holder (many surviving coins have been ruined by contact with the heavy plasticizers used in this type of soft plastic) and carefully wrapped them in museum acid free paper. 4.367 troy ounces of pure silver content. FDC