SOLVED: Strange Mid-Conductor Rectangle

Diggum

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I found this interesting chunk of metal, today. Does anyone have any ideas on what it might be?

It has two holes that go through it, the number 17, and a hallmark (for lack of a better term) that looks like GB. This is from a house I've been pulling 40's era stuff.
 

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And just to validate this ID, I looked at the "working end", and sure enough there is a slight curvature. Great ID! :dingding:
 
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