the KTM chassis is most likely a US Hobbies import. The second possibility is Max Grey which used KTM as a builder before USHobbies. Max Grey (the person) sold the business to the guy who founded Kemtron I believe, and he renamed it US Hobbies and continued the business in the 1970s at least until he solt it to Westside Models Company which managed to fold it up in a few years. Many of the same models done by Max Grey were reissued by US Hobbies with better details and motors.
The Diecast gearbox pretty much insures it is a US Hobbies import. All the Max Grey era stuff I have seen has had Brass fabricated gearboxes.
