Not to splash the mud puddle , but the process used with your cool little item involves fusing & polishing glass , not an enamel process .
The style of the wire-work seems 20th century to me , a best guess would be Chinese origin , but also a piece that took some time to make !
The radial grooves you see in the surface of the bowls' interior are a product of the polishing process , and as a gen'l tip-for-the-future - keep an eye out for old work that has been polished to a point where you can't see 'grooves' .
Getting a fine optical polish job on this type of work is a patient process , where just a bit too much heat/expansion from abrasion (dissimilar mat'ls) will crack the glass bits ....
It's not unusual to see 'rough' finishes , esp. on antique Japanese champleve articles , though .
Bronze , gold , silver , platinum & a buncha diff metals have also been used by artisans , while working with such mat'ls .
Purdy little do-dad , GG !
