French Marine Button ?

[Rick (Nova Scotia)]

Don't know for sure hence the question mark, but it does seem very similar to a couple IP found earlier this fall.

27 - 28 mm, quite domed, has a bit of a nipple to it, and a shank I don't think I've seen before, "a stick that was looped back on itself."

 

[arrowhead82]

I'm not sure what it is, but I like it! nice find and good luck with the ID.

 

[Iron Patch]

Nope.

 

[HutSiteDigger]

perhaps... mid 18th century?