Thank you Wayne.
There was no scaling / lime deposits to be found. Inside the tank was amazing clean as was the the engine apparatus. It was 100% used a bit, since there was carbon on the bottom (from the flame). Also it had quite a bit of string wrapped around the shaft on the pulley side - so someone had ran it with an accessory during its lifetime. So someone played with it, took care of it and likely was important to them.
Now she is a self queen (I updated my 1st post with a photo after I did a little paint work on it).
Edit:
After my video, I used a little Teflon tape on the Whistle & Throttle screws. That completely stopped the leaky/bubbly whistle & throttle and gave me a little bit more power. Actually, I had to keep a eye on the pressure valve as it started to bubble - so that is telling me I am getting pretty close to max pressure.
I think the piston is suppose to have a brass facade / plate. Or at least it is grooved like one could be snapped on? Maybe one day I'll find an original burner or a #1 with its burner. I am guessing its base is a little larger in diameter, as my #17 burner base seems a little small.
I am also getting early Weeden whistle from my brother, we think it has a whistle cap that I could transplant to the #2's whistle. If that works, I'll post a photo of it.