United States, Scott #5557, used(o), 2021, Chien-Shiung Wu (1912-1997), an American nuclear physicist; during the Manhattan Project, she worked at Columbia University, helping develop the process for separating uranium metal into U-235 and U-238 isotopes by gaseous diffusion; this process was replicated at a grand scale at the World War II K-25 Plant in Oak Ridge; Wu was born in a small town near Shanghai,; her father believed in education for girls; she studied physics at university in Shanghai; In 1936, Wu arrived in San Francisco and enrolled at the University of California, Berkeley where she completed her Ph.D. in 1940; serpentine die cut simulated perforations: 11, offset lithography printed by Ashton Potter USA (APU), 'USPS' in microprint on the right side of her blouse pattern below where her left shoulder blade would fall, to the left of the left arm slit on the blouse, non-water soluble sheets of 120 in panes of 20; multicolored, forever stamp at a counter value of (55 cents), Scott supplemental catalog value: 25¢, nicely centered, light, black-inked, wavy line cancellation across the top half of the stamp and into the main image, good perforations, stamp was issued pressure-sensitive, self-adhesive panes with a water insoluble gum, this stamp was soaked from the mailing envelope using the Bestine solvent and placed on a piece of black trimmed card stock for an attractive album mounting; centering, mounting and image clear cancel warrants a selling price premium. This is not a 'bait-and-switch;' the stamp you see will be the one you receive.
Please review my terms of sale. If you are not ordering from the United States, there is a $US1.50 additional postage expense that needs to be added to the price of the stamp. If you are ordering from the United States, there is only a $US0.66 added postage expense. Also, if you make additional purchases from my offerings, they can all go in one mailing at no extra shipping expense for the added purchases. I will send the purchase by US first class mail, since the relatively low value of the stamp does not warrant signature or tracking mail. Hence the buyer assumes risk of loss or non-delivery. I will keep a scan of my mailing to verify that the correct mailing address was used. If not satisfied, return the stamp to me at your own expense, and I will refund the cost, but not my postage to you. If the stamp is not as described, I will refund the cost and reimburse you for postage both ways.
By way of reference, I am an American Philatelic Society member (195176) and an American Stamp Dealers Association (ASDA) member. Thank you for looking, and I hope this is the perfect stamp to fill that gap in your collection.
