Hi Jack, Nicely done up #50.!
However it is not from 1960.
Remember it was light blue or blue green.
There were no brick fireboxes for the 50 in 1960 or 1961. (I have a 1961 #50)
1930's through the early to mid 1960's all had the tube site glass and flywheel was not red.
They also had solid wood bases with breadboard ends and a brass tag.
You have done a real nice job of giving it the "look" of a 1960 engine.
Best of luck with your sale!