Just for reference on Sun Sola lenses, the following are listed at
http://www.camerapedia.org/wiki/39mm_screw_lenses
* Sun Xebec 5cm f/2, all chrome collapsible, successor of the K.O.L. Xebec 5cm f/2
* Sun Sophia 5cm f/2, all chrome
* Sun Xebec Telephoto 9cm f/4, black and chrome
* Sun Sola 7.5cm f/3.5, black and chrome or all chrome
* Sun Sola 9cm f/4, all chrome
* Sun Telephoto 13.5cm f/3.8, all chrome, direct mount
* Sun Telephoto 13.5cm f/3.8, all chrome, for a reflex housing
* Sun Telephoto 13.5cm f/3.5, direct mount (reported only)
A couple of years ago I saw a Sun lens on eBay that was *not* on the above list. It was a 5cm F3.5 Elmar-like collapsible being sold by a Greek camera dealer (I think he's still active there). It finished well over $300. Obviously a real collectible by those into these sort of rarities (I'm one of them!).