I picked up a new intermeshing rotor helicopter made by T.N. (Nomura Toys).
This "Sight-Seeing" helicopter has the same body style as another T.N. series of toys, but the body has been modified to accommodate the twin rotors.
I think the run on this one was pretty limited. This is the only boxed version I've ever encountered, and you might note that the factory, or perhaps the distributor, added the toy number to the box lid by hand.
Here's a photo:
T.N. Nomura Toys Sight-Seeing Helicopter