I have zero information to go on, so this is a call for those with snippets of knowledge, old adverts etc. to post here to compile a build sheet of sorts - so, what do we know??
Gallery pictures: http://www.retrobike.co.uk/gallery2/v/u ... =xc6716546
I've got a complete original bike (what's not original I can remember what it was originally...) so can pretty much tell you exactly what the original config was...
Wheels - Araya 26 x 1.500 Alloy with Exage FH-M450 solid spindle hubs
Exage Mountain Groupset:
6 Speed SIS Rear Freewheel
Exage Mountain Rear Mech
Exage Mountain Front Mech (bottom-pull)
Exage Mountain Cranks (175mm) with 28/38/48 BioPace SIS Chainrings
Standard non-cassette type BB
Exage Mountain Pedals
Rear Brake - Exage Mountain U Brake
Front Brake - Exage Mountain Cantilever
The headset you've got looks original, certainly the same as mine
Exage Mountain Brake Levers
Exage Mountain 6 Speed SIS Thumb Shifters (affixed to Brake Levers)
620mm wide Cro-Mo Flat MTB Bars
30º x 125mm Cro-Mo Stem with integral Pulley for Canti Brakes
Micro-adjust Alloy Seat Post (could be Kalloy...?)
Kalloy QR pinch Bolt
Viscount Leather-faced padded Saddle (can't make out graphic... Penta Proeizil...?
Think that's about it... Mine had Tioga Farmer John's Nephew tyres on when I got it but they may not have been original...
Happy to post / PM / email pics if it helps
Good Luck with the build