Ah yes, the legendary Monogram Visible models . . .
When I was 12 or 13 years old my parents bought me the Monogram Huey helicopter for Christmas. I think it was a 1/35 scale model - It was HUGE for models back then. Alot of the interior pieces were molded in color (silver, black, ZnCr Green). Probably one of the best gifts I can remember as a kid.
And the motor that turned the rotors actually worked !
Great fun !