The Stuart 7A is a medium sized vertical with a square design
of 1" x 1" bore and stroke. Your model also has the optional
reverse gear unit. Nice to see that the Jensen Boiler has more
than enough steam to run this size of engine. Thanks for the video.
Arnold
I searched high and low for an exact model # but can’t find it. 7A is closest I could find?
Hi Travis, That 7A you have is the exact model.
I know because it came from the Office of Steam.
It is part of a collection I got from Andrew Burr. At some point I passed it on to Charlie.
Gil
Thanks Gil!
It is just on loan. 
No worries at all... Good that it brings us all some enjoyment!