I’m never the guy with the yard sell treasure find. But I bought a box of what the lady said was “bow junk”. Couple packs of unused Zwickey Delta 4 blades, several loose Deltas. Two True Angle hones one for 3 one for 4 blades, tru angle leather strop for 4 blade. Two dozen Bear Razors most never mounted but all un sharpened or used and a pack of the bleeders . Bunch of the rubber 4 blade arrow covers and various old broadheads Bodkin mangus
and some parts for a blitzenburger fletcher bags of nocks, inserts bow stringers etc. . She was firm on the 10$ so I gave in.
Anyway the point of the post. Does anyone know when the Deltas went from Blue to green? Specifically the light blue ones? I’ve read the Zwickeys were originally black but can’t find info on the blue to green.