The ignition switch was a "panel" switch used on a few Fiat sedans with flat dashes like the Goose, Fiat 600 comes to memory glands.....but that crowd pretty much sucked all the spares up across the planet years ago! (Hmmmm, I wonder why?)
There were some "very cheap" knock offs selling a while ago, which I bought one of, and was so unimpressed that I tossed it in my box of spare parts and never installed it..... Had an original lose it's smoke...and burn up my wiring, wasn't going to trust a cheap copy......
We've been over this topic a while back and had come across some very close looking switches with a knurled nut, from the auto parts plastic racks...... I had to put some spade connectors on screw terminals in my case (stuck away from home base!) but others found some suitable switches with spades....... These were "tractor" or other such items that needed starter switches....
The classic "failure symptom" before failure is a hot ignition switch while headlamps are on....... New switch is cool as a cucumber!
In my case, the hot lead was the bottom connection on the switch! When it failed internally, bits fell down inside and shorted case to hot! Lots of smoke......
Therefore, I strongly recommend that people invert their original switch so that the hot lead is on the top. Looks the same externally....but protects you a tad more! (I hope!) Also, install a quick disconnect on the NEGATIVE side of the battery! In case this does happen, then you don't need to scramble to find a wrench.....while your car wiring burns up!
Ciao!!!!