Can you help to identify the makers mark. Its either an M or a W? Or even what it could be from? It?s on the thicker side and flat, but does have a bevel on the edge under the metal ring. It does not appear to be corrective at all either.
Is it threaded on the outer edge?Perhaps the piece that holds the lens in place in the objective of a binocular or telescope,or on a gauge as Tpmetal said.
Is it threaded on the outer edge?Perhaps the piece that holds the lens in place in the objective of a binocular or telescope,or on a gauge as Tpmetal said.The mark could have been put there by the owner,it looks pretty rough.All supposition.
Is it threaded on the outer edge?Perhaps the piece that holds the lens in place in the objective of a binocular or telescope,or on a gauge as Tpmetal said.