FREE: USA #1496 1973 US Mail - Loading mail, mint

Yes, there at 10 different designs for this series, they were printed in a row of 10 different designs and there were 5 of these rows on a sheet.

Because of the length of the original strip, even stamp albums only show these as singles due to the size (which is 10.25" in length)

I do have a strip of 10 left, do the nature of Listia points, I can't sell the strips as a whole, and I would have to charge at least 8,000 points plus $2.50 (within USA) postage for it to be worth it (as this would have to be mailed at the parcel rate). On the other hand, I get decent response out of selling the singles.

In fact, I can't even mail them as an unfolded strip of 10 since they are longer than a standard envelope, so the cost to mail the strip would be several dollars at minimum, or the strip has to be folded in the middle.

Yes, 50 stamps to a sheet: there were 5 strips of 10 different stamps on a sheet, I do have 2 strips left from the top part of the sheet (which includes large selvedge with extra inscriptions), and a third strip that has been divided into the individual 10 stamps for sale.