what is this razor that I just bought?

[ShaveMark]

I thought that it was an old type single ring but it looks weird at the bottom like it doesn't quite fit right. There seems to be missing a bottom smooth ring near the knob. Any ideas?

 

[eyeguy]

Looks like somebody cut the bottom off to me.

 

[nemo]

Looks like somebody cut the bottom off to me.

Yep