Anyone recognise this petrol tank?

[56nomad]

Hi all,

I bought this tank simply because I liked its shape but I'm intrigued about its origin.  In steel, it's approx 380mm long (excl lugs), 265mm wide and 185mm high.  1.5" filler with twin petcock outlets.   2 threaded hex bungs on the underside near to the tunnel.  Also appears to be artisan gas welded as opposed to production line electric resistance welded.

It looks Panther M100-ish but it doesn't have the dimple in the top.

Any ideas?