It is definitely Signal Corps.  It appears to have gold gilt on wreath.  If so, it was worn by a non-commissioned officer between ca. 1905 and 1917.  A bronze version was used through 1918.  A good ID source is:

 

Emerson, William K.   

1996    "Encyclopedia of United States Army Insignia and Uniforms."  University of Oklahoma Press, Norman.


Kevin O'Dell
Principal Investigator 
ACR Consultants, Inc.
www.acrcrm.com

1423 O'Dell Court
Sheridan, WY 82801
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----- Original Message ----- 
From: "Mills, Robin O" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 12, 2012 4:02 PM
Subject: needing military insignia ID


Histarch,

I have what appears to be a military insignia pin from a small mining town in Alaska. Please reply off-list if you are familiar with these items, and willing to take a look at a JPEG which I would send to you.

Thanks so much.

Robin Mills