Tokaido "Sport 12 Gang" mixte !
Lots of oddball machines have paraded on my garden path, but not one quite like this..
By the component parts, I'm guessing it's 1970's, and it appears to be Japanese. I've never come across the Shimano FF System "chainring/wheel bottom bracket" type before, you can pedal forward (obviously) in the normal manner, but if you pedal backwards....it freewheels without the chain rotating in the opposite direction as in the conventional manner.
So it's not conventional, not fixed, not known to me....is this what a mixte really is ?