todays mystery object

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jim1950

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Can someone please tell me what this is? It's been around in different workshop's for year's, it first turned up over 30 year's ago in a chest of draws in for restoration
it keep's heading for the scrap bin but I always think I must find out what it is.
 

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It looks like a pair of single-handed dividers to me. Used by navigators on ships and boats when charts were paper.
Except there's no apparent hinge or pivot point where you'd expect, the legs are blunt and imprecise, and you can see the slot where the spring of a Jew's harp used to be.
 
Probably wrong - but before the development of ring pull technology a lot of canned fish (eg anchovies) was sold with a similar key which engaged a metal tag which was turned to "roll" the top off.
 
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