eBay

There's one similar on Etsy, no date or maker though. Are there any marks on the bottom?

I think it's George Ohr. And the Mary below his signature is Mary O'Keefe.

I agree with the previous post. Just disclose it. One thing I have found on glass, porcelain and pottery that has what I agree with you, looks like a bug. When I get through cleaning it, I'll get alcohol or mint type toothpaste. Dob it on the spot an...

Not identical so probably a set of 4