Czechoslovakia - Enamel Types #4 Silver relief

.....The same theme here as before, these are examples of tango glass from the Czechoslovakia region circa 1920-1930. They are flashed with some kind of acid or chemical over a stencil to make a reverse picture. These scenes are usually in a nature scene. It may just be silver deposit technique as they seem to wear the same way. Are they a cheaper grinding look or cameo type? You be the judge....jm