Yeah they were introduced in 1938. I have never used them, but I heard good things about those blades.
Nice score.
On my way home from work today, i stopped by the local antique shop and picked up this:
NOS blades, the box had the plastic wrapper that i took off. $5
They're coated with something, i have no idea though. Also not sure if i will use them, but i'm leaning towards yes.
Any one know what year they're from?