Yellow vase has silver overlay decoration that has tarnished and looks black.
The yellow is fired-on the inside. The vase had "Made in Czechoslovakia" on the bottom which seemed to be in the same silver as the decoration.
This decoration has also been found on glass marked made in Germany. The decoration seems to be exactly like the Cupid etch which has been attributed to Paden City but that attribution is coming under a lot of scrutiny.