Re: waltham side real and astrinomical
The 1892 model Waltham "Sidereal" and "Astronomical" are scarce, high grade, and desirable watches. The examples of these watches I've seen have been basically the same apart from the difference in "Sidereal" or "Astronomical" dial marking. Congrats on having an example of each of these great watches!
Here are some photos and details of an "Astronomical" that I had last year ...
... and I would enjoy seeing photos of your two watches if possible.