Diamond and Line Pattern Clear Glass Globe Vase / Elaborate Mystery Mark on Bottom

This one is a bit of a mystery. A rather plain looking clear glass vase. It measures 4" at the opening, 6" in the middle and 3" at the base. The pattern is diamond on the bottom half and just plain lines on the top. The interesting thing is the elaborate mark on the bottom. A long stem rose with what looks like script letters above it. The first one looks like an "H". The middle I really don't know, and the last letter looks like a "G". Haven't had any luck finding it online. Anyone know ?? -Mike-