It would appear to read Mdina 08, I can't make out the rest of it, but you could try asking the Mdina works.
http://www.mdinaglass.net/index.htmWavy frosted stuff is later than my period of interest, although this is a rather nice rendition of "Earth" (it looks a lot more like the earlier "Earthtones" design Michael Harris instigated there).
Although the name has been changed, and how well it is executed has been subject to a lot of variation, it has basically been in production from the start.