I am not familiar with the hallmark on the bottom of this mustache mug, but I believe the piece dates from before WWI and it is bisque!! It has a lovely opalescent finish as well as the seaside graphic scene on the front!! However the spout has been repaired and has a few TINY nicks, but it is an excellent candidate for the Japanese restoration art of Kintsugi!! SOLD AS IS for restoration!! Approx. 4" high X 6.5" from handle to spout X 3" in diameter across the top X 3.5" in diameter across the bottom!! Please see my many other collectible and antique listings and email me with any questions!!