I haven't seen this late 19th c. button before. I am pretty sure it is gutta percha (possibly another natural rubber) and it is 1/4" thick. It's almost black rather than brown. It measures 2 & 1/8". A whopper. When Polly wants a cracker she just swoops in and helps herself.
3 other shoppers have this item in their Cart or Wish List
Your Satisfaction Always Is Guaranteed