These come up on ebay and some of the other US sites like Etsy and Ruby lane from time to time so I'm thinking they were American, probably W.Virgina made. They have a feel like they might be Viking. Some have thought possibly Blenko but I think if it were Blenko I'd have found it by now.
It's approx 7" x 7" wide x 2 1/4" tall
I think I've missed my opportunity to take advantage of the St Pat's related sales on ebay