Button age

[collector01]

Usally I know my buttons pretty good. But what years were these made? Has two small holes threw bubble on back with no marks. It's a two piece new York state seal button. Found in trash pit with glass from civil war until 1880s. Thanks

 

[collector01]

Here is the back

 

[TheCannonballGuy]

That version of "self-shank" button back which you say is on your NY button was patented in the very early 1900s. Although I saw that Patent once, long ago, probably here in the What Is It forum, unfortunately I don't have a copy of it in my patent-diagrams folder, and I can't recall whether the patent date was 190-something or 191-something.

 

[nhbenz]

Here's one such patent, but it's from 1933, and I too thought there had been one posted for earlier than that... and I'm surprised it wasn't referenced by this one (at the bottom, where similar patents are cited, to show that they weren't infringing on them): https://www.google.com/patents/US1967958