Help with button

[plymouthian12]

Dug this the other day. Thinking it's a ww2 air force medic button. But not sure. Thanks for you help

 

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[fyrffytr1]

US public health service button. Here's a link to one identified by The CannonballGuy in 2013. It is actually listed in Albert's book as FD-74 on page 286.

http://www.treasurenet.com/forums/what/341218-two-mystery-objects-one-mystery-button.html

 

[ANTIQUARIAN]

Great information link provided by fyrffytr, kudos go to TheCannonballGuy for his incredible button knowledge!
Date wise based on how the back looks, I'm thinking early 1900s.

Nice find,
Dave