Fiddle or violin estate brooch Antique jewelry enamel instrument c clasp pin

This very old brooch was inherited from someone born in 1920 so who knows how old it is? The back has a mark that looks like an 18? It is old enough to have a c clasp that is stiff and still sharp. It has tarnish consistent with age and there's spots in the front enamel but one must not expect perfection ftom the aged and this item looks very antique See all photos As is Possibly Czech, Estate jewelry I would guess from the closure, which is a C-hook, it could be as old as pre-1920s. I think the metal is bronze and it has lovely patina as you can see from the image of the back. It is also very hard to tell the true color but the second photo shows the creamy color in it's truest tone and tiny colour specks. The enamel is in very nice condition for it's age although there is a very faint crack in a u shape on the body at the base of the neck. You can only see it under magnification and in the zoomed in photos but I try to give full disclosure on the true condition. The strings are a bit bent but undamaged. I am not going to attempt to clean this piece as I am not an expert. This seems to me to be a very rare and collectible piece and I think it would make a wonderful gift. There is something stamped on the back, but even with magnification I can only make out what looks like a T and an 18. Possibly 1918? It is about 1 1/2" long. This is a real treasure and is already of heirloom age and quality!