U.S.M.C. Collar pin age needed

[Woodland Detectors]

I always say, Find the biggest damn tree where your detecting, and you will find something cool. That's the case here anyway.Laying about 2/1/2 inches atop a big root laid this cool Marine pin/screw back. Can any one tell me WW1 or WW2? Thanks!

 

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[goldgrubber]

Don't know exactly, same as when I served '73 - '77. Not sure but I think if it was much older there would be more of green patina showing. Better to get one of the military collectors thoughts though.

 

[nhbenz]

The WWI design had longitudinal lines as well as the latitudinal ones. I believe the switch was made in 1936, so it would date after that.
The back is actually referred to as a screw-back rather than a pin-back, which has the two pins that jab you whenever you lose one of the backings.

 

[Woodland Detectors]

Thank you!

 

[digging wv]

Modern, same as mine 74 thru 86. Just looked at an old uniform to make sure.

 

[nhbenz]

If you were able to loosen up the backing nut it may have a marking to narrow it down further. A lot of these were made by N.S.Meyer, who changed their markings over the years.