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Old 12-07-2017, 04:13 AM
Marty C Marty C is offline
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Join Date: May 2015
Posts: 516
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Looks like a Martin thin line I put in an old Epiphone. Has about the same size black wire and the back end of the strap jack has a screw on cap just like the one in your picture. These thin line are passive.

https://www.ebay.com/i/122843397210?...D1385960040937
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