About 34mm diameter with slight dap, I have loved this piece for so long. Center hole is 3/32mm, and our rivet-washers fit it nicely, if you'd like to attach or fasten it to something else---another stamping with a rivet (or swedge hole as it was called in the stampings trade). Brass made from vintage tooling in copper ox with a green patina finish. The green is a little vague, mostly appears on the ribbing of the leaves and quite a bit on the back. Sold by the piece.