I am not an expert on Hobbs, Brockunier & Co. Glass ... but have attributed this to be on one of the No. 200 LINES. Certainly could easily be the MURANO pattern NO. 207 as the "ribs" are there ...just not showing as swirled ... you collectors will know. Most of these with the larger "plateau base" were often made to insert in a VICTORAIN SILVER BRIDES BOWL HOLDER and this certainly WOULD WORK. (3 7/8" in Diameter)
Appears to be heavy lead content, as it RINGS LIKE A BELL! What a RARE FIND!