NutLoose ... could be. I've just found a box of 7A/10147 Paper Fasteners, S.O. code 47-11 with a
King's Crown ... and ditto 9A/437480 Polished Brass Draughtsmans Drawing Pins code 68-35.
spekesoftly ... (May I call you 'Fellow Squirrel'?) ... I went back into the drawer to check the top of my white chinagraph, and agree your findings! i envy you for having some 48-364 leads, though - wanna swap for some -716 or -720?