My mother used to work the USPS. I used to avidly, and now occasionally collect stamps, and she always digs up some stuff around her house to give me for my birthday. I have a roll of stamps labeled on the outside “Stamp Venturers Sample Coils” which have a flying bald eagle centrally, part of an American flag in the upper left hand corner, and trees down below. It is gummed, and in black and white. Is this truly a sample, or is it usable US postage?
If it’s what I think it is, no, it is not valid postage. If you can, post a picture and I can tell you for sure.