My mother worked for Clyde J. Sarzin. He started his business from his home in Roslyn NY. When they outgrew that location they moved to Main Street in Port Washington NY and then to an office space above the Bay Bowl Building, also in Port Washington. My Mother started out typing the "consignment" letters. She eventually did the selections for the customers and others were hired to do the typing. The "third" part of the team was Lenny, who packed the shipments and took them to the post office. Each customer had a card which listed their interests. My Mom would then select covers for them. They would be mailed. The customer could keep what they wanted and return the rest with a payment. When I was 13 I worked during the summer for Clyde. I wrote the "title" of the cover on the back. My Mom was the one who came up with the idea for the Space covers. Some of you thought Clyde was a Collector. He was not. He was a dealer. When a new space launch was to occur or some other event....Envelopes were prepared with a stamp and the address. They were then bundled and sent to the Post Office where the event was to occur and they were postmarked. They were sent back in a bundle, not separately. As a result, there could have been hundreds of covers for an event. Hope this has helped.