Can anyone identify this fuel tank

[jonny the goat]

Have this fuel tank. Have no idea what its off. Any ideas ? It has a rubber edge along the bottom that is screwed on at each end. The fuel cap is a push on one and looks original to the tank, this has what looks like a running Hare on as a emblem. Has rubber knee pads that fit on to metal fitted tank plates. looked at loads of tanks, bikes and knee pad shapes online but can not find out what this is from. Any ideas ? Cheers, Jon