Mike, thanks for posting this - it really interests me. The Skysensor 2 is 1990 and before. The 3 version was new in 1991 and has a slightly more compact handset.
The guidescope you have is known in Vixen nomenclature as a "subscope" and has the two separate rings, whereas the named "guidescope" has the single spring loaded ring (I have a 60S guidescope)
As Richard says, only 1.25" eyepieces as it will have the 36.2 mm drawtube. Only the fluorites of this era have the 2" drawtube.
I can offer an estimate of valuation if you wish. This would be done on a basis of the "sum of the parts"
If I were you, this one is a keeper.
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