Thanks Alan think it is, looking at the images on S/G looks like 1st variation in green? though It's predominately brown with red and and a really vivid green with just the plume being 'green'
Maybe a second it does have a lot of flow lines in the glass. Though not seem them marked as such normally the C11G
The images on line of the 1st variation all seem to have the name and code etched on the base.