Ooooooooohhhh .... that's really nice!
Flywheel looks to be very true too!!
Obviously, a quality build out of quality castings, from a rather unusual material, with Weeden as a major exception!!!
I can even spin the flywheel backwards and pump the boiler up to 5 pounds of pressure. I think that says a lot about the fit and finish.
I also found a date inside the pressure gauge that lines right up with the time period I suspected this engine was built within.