The USPS issues Notecards which are notecards relating to a commemorative stamp with unstamped envelopes; however a commemorative stamp relating the same subject is enclosed for each envelope. They have been issuing these sets for many years now. Most of the time the notecards are all the same; if a collector wishes to collect them they are forced to purchase 8 to 10 of the same cards;
however, at times the notecards are different but related, in this case you may only end up with two to five duplicates. The USPS Bonsai Notecards pictured below is an example where there are two each of five different designed cards with matching stamps.
