I suspect that the relatively low BIN for this frame reflects the fact that with lugs that resemble quite closely gas-pipe fittings, the frame doesn't fall into that category of elegant frame that Ian used to ride. Think of those stunning pictures of Ian on his "Emery" aero-tubed TT bike, equipped with a narrow front fork to accommodate Mavic's newest baby, at that time, the ultralight 80mm front hub.
Clearly this particular Raleigh was produced during the period when the company was trying to respond to market demands for something radically different from the 753s that it had been producing.
Remember that there were Vitus 979s, carbon-tubed low-pros, TVTs and the like on the market at thta time. Raleigh's answer was the range, right across the board of road and off-road bikes, of frames using a variety of different tubes, at all levels of the ranges, bonded, with a Permabond adhesive into cast aluminium alloy lugs.
The results were not outstandingly pretty, but the frames were successful in that they rode well and didn.t come unstuck.. I have friend who still have the titanium-tubed versions of both the ATB and the road bikes, and they swear by them...and some of these were, prior to stumbling across the Raleighs, died-in-the-wool traditionalists...531DB and all that.
Norris Lockley, Settle UK