Vintage 1950’s Dennison Gummed Photo Corners Pack of 100

This is an opened envelope of Dennison Photo Corners made by Dennison. The package is from the 1950's and includes pieces of black gummed corners for mounting photos or postcards in an album.(100 for 10¢) there are pieces in the envelope as shown in photo (a bit hard to see as they are black) I don’t know if there are 100 or not as I haven’t counted or taken them out of package. On the back is a list of all the different colors available Measurements shown in photo. In good preowned condition.