Copper/Brass base plate, military?

steelheadwill

Gold Member
Jan 2, 2010
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New Castle NH.
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Detector(s) used
Brain eyes ears and nose
Primary Interest:
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Wondering if anyone has clues on this item,
marked 'C-5 60-'C 11 R.P.M. M1557 NF 9' as I read it.
Flanged on rear as if used for cap or base.
Thanks To All, & HH, Herbie.
 

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