Siebert 10mm, like new, 55 degree field, plenty of eye relief, very sharp. This is Harry''s newest production style and no longer has the somewhat "anateurish" look of his earlier eyepieces. It has a machined
stainless steel barrel with real filter threads machined on the inside, and a very nice rubber eyecup. $35 post paid in U.S. I take pay pal with a $1.00 surcharge. ( A money order would cost you that much anyway) Thanks for looking, Bob.