Probably not a Depression item, more like EAPG, perhaps a moderator can add that to your title.
It is reminscent of a technique of mould making called Crystallograph/Crystalloid that dates to the 1879, I had a record of US patent 219245 but that seems to be wrong.
My piece is a tray "Psyche & Cupid" which is presumed to be Riverside Glass Works, Wellsburg, West Viriginia but the mold makers were a Washington Beck and Henry Feurhake of Pittsburgh.