How old is this button?

[BeachPirates]

My wife and i found this on the beach in NW Florida. Not much of a relic hunter and dont know much about buttons but it looks fairly old. It sat in olive oil for several months and is a little shinier than when found although not much. Any help would be appreciated.
BeachPirates

 

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[BeachPirates]

Any ideas about the origin or approximate age anyone?

 

[Mrdigz]

If you guys found it on a beach then it's not in that bad of shape. I think it could be from the 1930s- 40s?? Hopefully someone can give you a def answer!

 

[metaldetector101]

It looks like an underwear button (too hard to tell age)

 

[BeachPirates]

Thanks for the info guys. If it came off someones underwear I guess it would have to be a few years old. Never seen underwear with metal buttons before.

 

[rick67]

Stamped buttons with holes (2-5) were made between 1800 and 1870 but were iron. Backmarks were also normal throughout the same period. Brass and Copper never seem to have a reference with holed buttons in 1800's. Rubber and Milk (plastic) then took over. So IMO 1900 to present.