21 & 22mm diam. postmarks both on 2½d stamps - no contents in the Envelopes  which look to be a fraction trimmed top edges - FOR SALE AS A PAIR, not an easy destination to find.   USSR.   PLEASE VISIT OUR EBAY SHOP FOR LOTS MORE AUCTIONS & BUY IT NOW ITEMS - MORE ADDED REGULARLY - PLEASE LEAVE FEEDBACK - BOOKMARK OUR EBAY SHOP AND RETURN OFTEN.