Button ID, need help

[john*vic]

Can anyone ID this button for me, I think it might be WW1 but not sure.
JT

 

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[nhbenz]

JT, Can you show the back of this? Also, what size is it? -Ben

 

[Daniel in Ak]

We really need the backmark to help date it.

 

[john*vic]

JT, Can you show the back of this? Also, what size is it? -Ben

Here is a pic of the back side of the button.
JT