This looks fake to me.

[Scott in Indiana]

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)

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[Badger]

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

Maybe some unopened old stock..

Regards,
Badger

[Bodyman]

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 ...

[RCS]

Originals look like this photo

[mikebaker1129]

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