Greeves Logo Challenger Sidecover Plate

This is a Greeves model 63C, QUB Griffon.  Doctor Gordon Blair of the Queen's University Belfast (QUB) worked on the Greeves 380 engine to improve performance - mainly by improving the cylinder porting and exhaust system.  The 380's power was increased by 6.5 bhp to 44 bhp.  The orange fiber glass metal flake color was named "golden glow". 
This particular QUB was manufactured in December, 1972.  The manufactures plate contains and interesting statement, " THIS VEHICLE DOES NOT MEET FEDERAL STANDARDS AND IS MEANT FOR COMPETITION PURPOSES ONLY". 
A close up of the 1975 race decals still on the tank.  The top one is from the Gila Bend Grand Prix and the lower one from the Rockinstraw Grand Prix.  The tank has some desert rash on the top left and will need cosmetic conservation.  I would like to find a good replacement, let me know if you have one for sale.  Of course it must be very reasonably priced - i.e. cheap.  :-)
Technical Specifications

Model 1972 63C Griffon
Engine 380 cc 2 Stroke
Weight 225 lb
Wheelbase 55.5 in
Gearbox 4 Speed Greeves Design