Louie,
There were 2 slightly different versions of the type 1 as far as I am aware. 1 with smooth sides and no eyecup and the other with knurling on the body and a rubber eyecup. Both versions have a dual barrell (2" and 1.25"). Optically I think both versions are the same. The 1st version came out about 1981, the 2nd version about 1985 I think. If yours has the knurling on the side it is the most recent version. I think they were produced up until the mid to late 1990's. The Nagler T2's were only produced in 12mm, 16mm and the 20mm. That 20mm brick you own is a T2, fine eyepiece but a lethal weapon in the wrong hands
These 1st hit the market in 1981 so are now 25 yr old technology ie coatings etc. They are an excellent eyepiece even by todays standards, which are exceptionally high. Light transmission, sharpness and contrast is down a little on the Nagler T6 and Pentax XW but is still very good. Kidney beaning is an issue for some users of this eyepiece, however I have no problems using it and I think its a case of getting used to placing your eye in the right place. Eye relief is too tight for eye-glass wearers but is fine for non eyeglass wearers. Unless Froggy has very bad astigmatism he shouldnt need to use his glasses with this eyepiece as the exit pupil is under 2mm in his scope.
This eyepiece is very similar in design to the Meade Series 4000 8.8mm UWA. Consequently it is also very similar in performance.
Froggy,
If you can't afford a new 9mm Nagler T6 or 10mm Pentax XW and dont need to wear your glasses while observing grab it son
. Its about 4 light years better than anything you own currently and really only bettered by the Nagler T6, Pentax XW/XL and maybe the Vixen Lanthanum Wides IMO for use in an F5 scope.
CS-John B
sorry dude * 
