[TSRF]

Definitely the Revell model, not the Monogram.

Early version, 1966 USA kit:

Scarcer version, USA kit 1967 (smaller box with styrene foam bottom)

British issue 1966 with shorter box and aluminum chassis:

I don't have a pic of the Chaparral handy, but the RTR version for both the USA and UK has this one-piece chassis. This is the last US packaging for both the Cooper and the Chaparral. In the UK it came inside a small cardboard box.

Revell also produced a few test shots in different colors, but few have survived.

 

[TSRF]

Malomay1968,
please have no doubt, it IS a Revell model assembled from the kit, down to wheel inserts and decals.
Not a Monogram, Strombecker or any other make.