I'm sure this will not have the wide appeal of a rare telescope, but it's a very cool piece of hardware. I have seen other spectroscopes in Classic Scopes, but never this model. It has three optical trains - one through the Amici prism for the spectrum itself, one for a comparison spectrum and one for a wavelength scale.
I found this pretty much by accident on Ebay. The seller was from the Netherlands and it was advertised as for parts or not working. I got it for a very good price and even if it didn't work, it was still a nice addition to my Optica b/c collection.
When it arrived, I checked to over and the variable slit worked just fine - so far so good. the little pick off prism for the secondary spectrum source also worked fine (it's a very tiny prism!). The wavelength scale was visible and I could focus it. Everything worked as it should. Then I looked into the eyepiece (actually just a window) to see if I could see any spectrum from a compact fluorescent bulb. Hmmm.... nothing.
OK, time to take the cover off. Inside was the Amici prism, but in three parts, all scrambled. I'm pretty sure these three prisms should be cemented together, but I can't say with certainty. I taped the three together temporarily, as the all the outer faces are blacked out except for a very small face on each end of the assembly. I stuck it back together and gave it another try. Lo and behold! There was a tiny, thin spectrum with some lines in it! Now I have to find a cylindrical lens for this setup.
Here are a few photos. The first is the the whole shebang. Not much doubt it was from Optica b/c, Oakland, California and made in Japan (by whom?). Serial number 6714. I wonder what happened to all the others?