Does it have a frame number ?
Assuming the RM idea.
Very early only the team blizzard looked like that style frame (very similar) but cabling was all traditional downtube.
Next Blizzard again but wrong routing, only the new fandangled wedge would use top routing though looks wrong and not wedgey enough.
Avalanche, well that was last years blizzard frame re-branded :?
Also they where putting two bottle setups on the frames. (according to the avalanche brodie shootout iirc)
By the time we are in 1990 things had modernised, wishbone stays top tube routing..
What's odd is I have seen that triple layout of cabling before, just not sure where.