1940s Black Crimped 6cm Hair Pins - 10 in a Roll

10 of them come in their original paper roll, which, when unfurled, proclaims

"WAVED 
GH
HAIR PINS
invisible
ask again
for
GH
QUALITY"

I think "invisible" might be a slight over exaggeration.
I found a box of these in an old warehouse I cleared.