ID maker?

[jjrothWA]

9mm case with three locations stamped @ 9, 12, & 3 o'clock position.

WMA @ 9, NATO emblem @12, & "13" @ 3

Who made it? Didn't come up in the "Sticky" for known headstamps.

Thanks

[Sunray]

Winchester according to the guys on the IAA forum. Supposedly a new plant and being used on White Box ammo.