Vernonscope 2" Amici prism diagonal. Allows for correct top-bottom/left-right viewing of terrestrial objects. A great addition for your small APO refractor! I purchased this new from Vernonscope around '97 and never used it. Prism has a clear aperture of ~31mm. With caps and box.
$130 shipped in the CONUS. Payment by Money Order, Bank Check, Personal Check (ship when clears), or PayPal (existing funds or bank transfer only. NO Credit Card funded transfers).