This Lyman manufactured No. 1A folding tang peep sight with locking lever and small turn down peep is marked on the underside of the base with an "AT" indicating that this sight is for the Remington model 8 self loading rifle. The overall condition is very good to near excellent retaining most of its original blue finish with light wear and a few freckles of rust staining. The mounting screws are not included.  (file photo)