All 3 are Entire Letters - one undated but probably similar vintage to the two headed 1770 and 1788 - at least part of the contents shown for all 3 and FOR SALE AS ONE LOT.  Postmarks on two very faint, one in red is the best example.   ITALIE, LETTRE, FLORENCE.   PLEASE VIEW OUR OTHER EBAY AUCTIONS AND BUY IT NOW ITEMS - MORE ADDED REGULARLY  - PLEASE LEAVE FEEDBACK - BOOKMARK OUR EBAY SHOP AND RETURN OFTEN.