This Exbor cup is very heavy, at least 1 KG. It stands 12cm by 10 cm. It is signed twice and is dated 1984. One signature is of Jiri Tesar, perhaps the finest living engraver who was associated for a long time before Exbor closed its doors. See http://www.jiritesar.cz/ for more information. This is quite an early piece of his work, today he teachers engraving and designs his own pieces.
It is also signed Exbor. It seems to be engraved with Poseidon, the god of the sea. Please see photos. I am used to sending art glass safely in the post. Any questions please ask.