Pin my dad found..

[Tlh325]

Looking for information on this pin..
Thanks in advance..

 

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[Retired Sarge]

US Army DUI (Distinctive Unit Insignia) for the 23rd Infantry Regiment.

https://en.m.wikipedia.org/wiki/23rd_Infantry_Regiment_(United_States)

Interesting history for the unit during WWII.

https://www.lonesentry.com/unithistory/23rd-infantry/index.html

Any markings on the back? Some are marked as follows.

DENMARK
N.Y. D22

 

[smallfoot]

Good find Tlh325 and good id ffuries!

 

[Tlh325]

Here's the back.

 

[Mackaydon]

Great ID Sarge !!
Don...

 

[Retired Sarge]

Here's the back.View attachment 1877842View attachment 1877843

Based on the Hallmark style yours looks like it dates from the 60s. Here's a diagram showing N.S. Meyer Hallmark variations.

 

[Tlh325]

Cool, thanks