Help with Pin

[SilverDreams]

My co-worker found this pin his first time detecting. He thinks it is copper or bronze and it has a castle on the front. That's all I know. Can anyone give me more information on it? Thanks.


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[IronSpike]

US Army Corps Engineer Pin.

Vintage U.S. Army Engineer Brass Pin Back Collar Disc Castle Insignia | eBay

 

[Gunrunner61]

Your good and fast Iron Spike............HH