Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Steve Tyner confirmed the sight glass is original Jensen. I too thought it was not original but have been told otherwise.
It also has a very early arm control for the governor.
I've actually done a lot of homework on this engine. There are several things that are unique about it.
There are very few early Jensen #50's to go by.
The smoke stack is flared. It only fits one way. It is original and was made that way.
I also thought it was upside down at first but it's not.
The immersion heaters are also very old circa 1930's.
Definitely not late 40's.
May be one day you will all get to see it in person.
May be cabin fever next year.
The wood base is also a very think solid board. It is consistent with information Tom Jensen cut down a tree in his yard which he used for the solid wood bases. I've not seen any other early engine with that solid wood board.
It is something you just have to see in person.
Also there is no router edge. The wood matches and is consistent with the #20 Deluxe Big Power Plant I have.
All the other #50's I've seen have a router edge are plywood.