German order Lithopane Steins

This is a gorgeous stein featuring 2 lovers kissing by the water- it is from around 1920 and is porcelain with an art transfer. The lid is pewter and the lithopane bottom is two women and a man sitting at a table. There is no makers mark other than a diamond shape in the pewter under the handle. The lid has been engraved around order the edge "Math Hietman" in cursive. The black glaze on the bottom of the stein is somewhat worn, indicating that this has been used. Written in glaze at the top of the ivory area is 1/2 L.
It is 9.5" tall and 3.75" in diameter at the bottom. I purchased this at a collector auction. There is a hairline crack in the bottom.

Free shipping in the US and this is HEAVY at 1.15 lbs.