I have five late sixties vintage Clave plossls for sale.These have the Clave Paris logo on the top of the barrels. Focal lengths are 45mm(deal pending),20mm(deal pending), 12mm,8mm, and 6mm.The barrels of the three smaller focal length eyepeices have been threaded on the outside for about the first one fourth of the barrel. This was done for parfocal use with a Unitron Unihex . This in no way effect the eyepiece as far as fitting in your focusor though. The main reason is that these eyepieces are not of a traditional eyepeice barrel size. The 45mm is a true two inch barrel and works fine in my TV Everbrite diagonal. The others wil require a 1mm adapter of which I have exactly one. I have posted a picture of the smaller eyepieces and adapter along with an insert showing all of them.The adapter is an easy fix as all it is is a piece of aluminium tubing.
These are the real deal old school true plossl design Clave's. They are in pretty good but not pristine shape and gave very good high contrast views of Mars. They were way better than my other Plossls and my coveted 8mm Brandon as well. Same results when compared with my 6mm Ortho. As the barrel size is an issue I will not be asking the normal $250.00 that these usually go for. The 45mm is $250.00. All others are 200.00. The first buyer gets the 1mm adapter pictured.