Hey - I managed to see what I believe is the han hoth blaster at Star Wars: Visions.
It was the MGC base, with the flash hider that has the details drawn on. To me they looked like sharpie thickness, not like a thin pencil.
The scope bolts were identically sized, but the front one wasn't screwed completely in and was slightly askew.
The flash hider had a definite step where the diagonal cone met the cylindrical base. Both it and the scope bracket looked really hand made and a little rough.
I managed to take a couple of embarrassing pics, out of focus and horrible. Worse than the existing 35+ year old pictures. It was an iPhone and a point and shoot in low light. I had a bit of an ordeal to get them though, in Japan photos are not usually allowed in exhibitions. It was also packed with 100s of people doing a big conga line around the edge of the room, spending equal amount of time with each exhibit like a big shuffling queue. I had to stand still in the middle of it. I had 2 attendants a few feet away from me and was told off for taking the pics I got. Doesn't helping being a white guy over 6 foot in the middle of Japan at these moments, I stood out a lot and was collared straight away.
Now, this exhibition had a lot of really bad replica costumes and props made up for the crowds - but this had the lucas museum tag and looked legit. I'll post the pics up when I'm not at work. If it is anything interesting, I'll go back with my DSLR and act like a dumb tourist.
It was placed with the scope side up, other side not visible.
edit: They also had a resin looking (but might have been real) ROTJ Boba blaster, resin Leia blaster, resin DH-17, real parts ROTJ E-11, ROTJ Stormtrooper suit (which had some interesting details on the helmet, but might not have been screen used. It had ventilation holes drilled in it and the decals and ear paint looked different to what I always thought), a weird looking Vader ROTJ stunt with some grips missing - looked different to the known one and may have been a promo one (had the lucas museum tag though, was definitely vintage), R2 and C3P0. R2 looked a bit shabbily made, but also had the lucas museum tag.
They had an old Vader suit too, but I know nothing about that costume to verify what it was or if it was used in the movie. Same with Han's belt rig. They had it, but I don't know which one it was.
Also for real props: Jedi training remote, hoth macrobinoculars, "rebel sensor unit" (the scanner from hoth, big white box with aerials) but these where in a bad spot to view.
It was a very awkward exhibition with the huge numbers of people and the big conga shuffle.
It's in Osaka, if anyone is in the area.
https://c4.staticflickr.com/9/8281/28403155475_58b741d176_z.jpg
https://c2.staticflickr.com/9/8603/28324057281_1b6d7b4148_z.jpg
https://c7.staticflickr.com/9/8855/27786650814_7d85e31fc7_k.jpg
Even though these pics are pants, I have the raw files for the first 2 (lol) that can maybe show more detail.