Vintage NUACE photo mounting corners, black

Very old black gummed mounting corners for vintage photo albums. I didn’t lick one of these to taste it, but they look like they are in great shape still. Have to be 40s or early 50s, I know they are not later than that because I have my old photo albums from the 1960s and that’s when the plastic sheets and the sticky pages came into fashion. There were 100 in the pack. I spilled them out of the envelope so you could count how many are left… Don’t ask me. And, no, I didn’t drop any when I put them back into the original package!