This was recently bought from one of the Mamod forum members for a very good price. The condition of this is pretty much fresh out of the box. It came with all instructions, original box etc. I would say this is one of the first blue based engines due to the fact the SV/whistle is the older type, I would estimate it at 1970’s. This is also the largest single acting piston engine Wilesco produced. A very nice little runner.