File scan.  Every ounce varies. treasure hunt USA 1800s to 2000s  airmail, back of book, pre-cancels, se-tenant,  plate singles, high values, uncancelled, documentary, multiples scarce and common.  approx 350 stamps to the ounce based an a few random counts....BUT sold by weight only. Quantity mentioned only to gauge what you can expect. but sold strictly by weight  not count. could vary +- 100 pieces expect duplication  and some damage. This is an unchecked mix could have some foreign and or on paper.... not likely but mentioned for accuracy...so please take the good with the bad because there are no returns or adjustments.