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In answer to a few comments, firstly, the unihex is a must have from a collectors point of view. Polarex/Unitron made three different sizes, the most common catered for 5 x 1" EP's and 1 x 1.25" EP. The second type which is fairly rare holds 6 x 1.25" EP's and lastly there is the super unihex (very large) which holds 1 x 2" EP, 1 x 1.25" EP and 4 x 1" EP's. In Europe, Asia and Australia the unihex is known as a rotary eyepiece selector. I have a few unihex's and contrary to popular belief, they do not soak up lots of light as they still have the same single diagonal prism as a standard right angle star diagonal. Yes, they are quite expensive to buy, especially in the US.
Kal is quite right that Unitron (United Trading Company) never produced scopes themselves although they had a huge influence on the types and sizes sold in the US. I have owned many Polarex/Unitron scopes over the years and have had found that the optics have been consistently excellent. Ian, apparently Nihon Seiko Kenkyusho was a family owned company and closed its doors in the 1990's as you mentioned.
Even though I don't use my Polarex/Unitron scopes much these days, they are just fantastic to look at on display.
Cheers, Steve
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