Ts50er genuine Suzuki Tested working on the bike. Ignition switch with on position and the key will not pull out.

2nd position for lights and key will not pull out.

3rd position for park light and key will pull out.

Can't say it is the original one for the bike as the wires have been adapted at the plug end.

But it has the correct fitting with one flat side to fit into the mounting bracket on the top yoke. 

Lots of the gt range had the same switch. 

It is genuine Suzuki 70s or early 80s.

10 wires come out of it. See all photos.