Lyman “A”–some of them have the holes, most don’t. Guessing holes were used to remove the cap covering the folding joint. That aperture disk is smaller than the ones usually supplied with the 2A model sight. Looks more like size used on 48 rcvr sights.
I guess there were many different size apertures. I have the big one on my Lyman #103. Thanks Clarence, was going to email you about the sight, but I guess I don’t need to. That sight is on a M06 very late production. Front sight is a Lyman #5 or #5A. Big Larry
May 2, 2009
Its a lyman 2a. The 2 means its got the screw in eye cup and the A means its got the lever lock.
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I believe the two holes are for a “pin wrench” (might be the incorrect nomenclature) to hold the lever in the correct upright position while tightening the nut on the opposite side of the stem. RDB
Thanks Roger. That makes sense, but with all the Lymans I have had, that’s the only one like it. Very rare to see a Lyman on a M06. The sight cost about a 4th of the rifle. Big Larry