"Train" signet

Massive (t from 10 to 15 grams) ring with blackening in the form of metro car designed in the USSR.
Available with a matte finish on the outside and glossy on the inside.
The dimensions of the front part depend on the size of your finger: the average value is 15x17mm.
If you want additional engraving on the inside surface of the ring, please mention info in order comments.