104 envelopes. All sold together for one price. A few are marked First Day Issue. Cachet envelopes representing the United Nations, Postal Services such as Airmail, Special Delivery, Pony Express, The Red Cross, Easter Seals, and Christmas were samples of proposed envelopes for the specific series the Post Office was working on. I have not been able to find others like them. Rare envelopes now to find. Not in MINT condition but very good, and it would be wonderful to send out a friendly old fashion letter.