Who knows what Honda this tank belongs too?

[Leonardovans]

Does anyone know what Honda this is from?

It looks like a CB350 K0, but the mounting "cups" in the front are different, and the breather on the cap confuses me. It might not be the correct cap.

The petcock is also NOT the screw on type.

I bought it just in case for my K0 CB350 Supersport

 

[Barnburner]

69 CL175

 

[J-Rod10]

350 K0's look like this.