I bought it from the original owner. He said it was to mark his father's 1st Christmas 1938. As such they did not want to part with it. It was expensive. Several of the family members corroborated the purchase date being before Christmas 1938. They were very familiar with Jensen engines.
I've seen 10", 6" and 5" boiler engines. It would appear this is one of the earliest 5" boiler #50's out there.
Regardless it is a treasure and I have more surprises to come. ;-)
Enjoy the videos.
Thank you all for being awesome! I love finding old rare Jensens.