This looks fake to me.

This looks like a cut knurled knob to me. What do you think?

M1 Garand Springfield Checkered Windage Knob - eBay (item 350344653839 end time Apr-29-10 16:25:01 PDT)

I'm not a Garand collector, but that part sure looks brand new ... :p

Maybe some unopened old stock.. :dunno:

Regards,
Badger

Yup, that is a standard WWII grooved SA knob that has been spun on a lathe or something to introduce the checkering cuts. Shame to ruin a nice WWII windage knob like that ...

Good eye, especially given the quality of the images provided ...

https://www.milsurps.com/images/imported/deleted.gif

Originals look like this photo

Joe Scott use to make repros out of the standard knobs.
This could be one of his ?