...this one is very similar, but orange. I did the same thing after removing the original crank bolts, which as has been mentioned, are a PIA to remove without grinding down a 16mm socket.
I think you'll find it's styled after the French bicycles, with tubing diameters and BB threading along those lines. It's not the best shifting derailleur to ever adorn a bicycle, but it works OK...mine came up with someone from Mexico. The original pedals resemble medieval torture devices for the feet, which is why they get replaced, mostly.