This is a vintage mogey 1.25" eyepiece adapter. It came from a 5" brass mogey refractor I owned a few years ago. This part was lost and has been found. The bottom part that is threaded and would go into the focuser is brass the 1.25" eyepiece part appears to be aluminum. This is probably a later mogey item perhaps the 20's. This is all I know about this item and that it was on my mogey refractor.
Filed under: Eyepieces & Accessories