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Old 2nd August 2014, 11:02 AM   #10
cornelistromp
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I don't think it is a breech block from a breech loading cannon.
Breech blocks don't have/need reinforcing rings and the mouth of the block must be conical/tapering to to obtain a good seal.
I believe it is a thunder mug, but probably a early one 17th, 18thC . see large picture.

best,
Jasper
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