jeez that takes me back a bit, in the early 90's I had a Claud Butler Magna (2 in fact) which looked to be a very similar frame with the same paintjob, although I remember the Magna didn't have a replaceable rear mech hanger, as I found out to my cost.
Wasn't the Vantage the model up from the Magna? iirc I got my Magna from a catalogue, probably Grattans or something similar and remember seeing the Vantage in there too.
I think I had my 1st Magna in maybe 90' or 91', as by 93' I had moved on to an Orange Prestige.
Maybe I'll keep an eye out for one of these frames, aren't they oversize alu?
Glad it helped you reminisce - I believe the Vantage was higher in the range. I would say that it's Oversized Aluminium, and would have been quite the thing back then! Mine didn't originally have a replaceable gear hanger.
The previous owner of mine has hands like shovels and had virtually stripped the frame's Aluminium thread for the Rear Mech.
I contacted Claud Butler in Brigg, and free of charge they sent me some instructions with a gear hanger, a 3.5mm drill, a 4mm tap, some M4 C/S stainless fixings and some touch-up paint - which was sweet of them.
Sorry about the poor pic.
1989: Kona Cinder Cone | 1993: Kona Kilauea | 1996: Kona Ku | 1997: Kona King Kahuna Stars ‘n’ Bars 18” Vs - Kona King Kahuna 19” Disc - Kona Explosif - Kona Koa | 1998: Kona Hei Hei - Kona Ku | 2000: Kona Explosif - Kona Kula | 2003: Kona Kula Primo | 2007: Scapin Kyoto | 2010: Kona Kilauea.