I picked up a grouping of eyepieces on EBay some time ago; the price for 5 eyepieces was $250 more or less, but included pristine examples of a 16mm Galoc, an Edmund 28 mm and one with an approximately 8mm focal length. Seeing I had mistakenly sold my Galoc and not think of the regret I would experience soon after! The eyepieces came in a box of rock maple that had been made by a well-known furniture outfit.
Later, I found out that the previous owner was a monk who used these with a 5" refractor made by some fellow named Clark or something. So I not only had the eyepieces, but a provenance!
The 8mm eyepiece still puzzles me. Even at f/6, it has a 60* apparent field and very decent star images at the edge of the field. A Kellner eyepiece wouldn't have such a field nor an Erfle or a Koenig have that imagery.
I'm really stumped. My hands are so useless that I cannot disassemble the eyepiece.