On a recent RV excursion I was fortunate to acquire this Mod 106 3" Goto refractor. Dates from December 1958 and is very complete. The OTA has a few small marks but otherwise is pristine. The mount is in the same overall design as the other two Gotos I have with sliding saddle plate two bolt attachment, and at the same time contains components of the 4" mounts. The legs are different from other Goto legs for this size scope, fitting between the fixed legs for the 4" and the field legs. It also has the wire spreader arms of the Mod 105 legs with the remnant of the bakelite spreader pan and bolt. Another missing part is the RA u-joint slow motion control. It came with H6mm, H9mm, H12.5-25 convertible eyepieces, porro prism erector, solar/star diagonal, sun projection screens and rod, and lens cap. Finder is also pretty much unmarked from ring setting screws. As nice as the tube is, the chrome could use some work. All of those parts are removable though so possible to rechrome pretty easily. I do like the simplicity of the latitude adjustment 'box'. It came with a T-handle wrench for the Az bolt that I'm not sure is original and not marked Goto. Always a joy for me, it has those marvelous Goto leg bolts.
Optics looked good on Jupiter at 218X in stable SoCal air early one evening, but it needs to be collimated. I will not be using the lens cap after doing so, as I think terra's comments about it's possible effect on collimation sound credible for this model. We'll see how it works out when I get the time to do so. Acquiring this scope was really a wonderful surprise opportunity I couldn't pass up. It completes the upper end of the GK line for 1957/58 time frame for me. And of course more to compare and contrast with regard to innovative touches that GK was incorporating during the period. Pictures were taken at dusk so apologize for quality.