We have little information on Franz Grosz and his company Groszart. He was an artist who worked in a variety of media, including glass. He did not work for a glass firm, but purchased blanks (glass with no pattern or decoration), which he decorated by a process he called sandcarving. Although we have two catalogs of his ware, it is all smaller objects - tableglass, vases, etc., and no large pieces. He often sold his glass through a firm Mary Ryan. I am able to find him at the address you have from 1946-1957, but this is a time period for which we have few directories. In 1951, the firm was in Elmhurst NY and was owned by Joseph F. Grosz and Robert Bodkin, and listed themselves as "decorators of glass for giftware and decorative architectural purposes". It seems possible to me that he purchased a plain glass table, or your parents provided him with one, which he then decorated. Our museum cannot provide appraisals or estimates of value.
