This circa 1960 manufactured Lyman No. 66 receiver peep sight has the slotted adjustment knobs, steel base and is marked "Lyman / 66W88" which indicates that this sight is for the Winchester model 88 lever action and model 100 semi-auto rifles. The overall condition is very good to near excellent with light wear and oxidation staining. The mounting screws are not included.  (file photo)

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