The zombie thread awakens!
Thanks verktyg for the info on those early 1970's Maxy cranks with the big ring made from flat stock and swaged on.
So lucky I'm light, because I've ridden a
couple of pair of these cranks hard, really hard, and have yet to spin one. Only a couple of thousand miles each though.
The ~1973 arms do say "forged" (see below) on mine, and so slender as to be scary!
Somewhat surprises me that many people raced on them, but certainly in some locales a lot of lower-level parts are used for racing.