Very sweet engine. Do all model 50s have the 3 port hole sight glasses?
I want one but I cry at the sight of the price. Looks very powerful. 
Earlier style had tube sight glass, my 3 window has a flat boiler end, later ones have a convex boiler end.
I believe they are sold as 1/10 HP
I only paid $350 for my other 50

But had to find it fast before anyone else and drive to Oklahoma!

When I bought it, the price tag of $100 was still on the base, so who knows how cheap the previous owner got it at the estate sale... I hope to have that one up and going for the LeSueur show...