Long Branch No.4 Rear Sight w Very Small Aperture ????

[RCEMERalf]

I will hopefully attach a picture of a LB sight with an unusually small aperture. Any ideas how this came about or what it might be for? I have it on Ebay closing Sunday 13 August. Thanks.

Information

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[Warren]

Very early rear sight. Will have two "rails" each side of the iris and be checkered..... They are not common anymore.

[barbarossa]

Correct for 1941 or very early 1942 Long Branch No.4 Mark I/I* production. Same applies to 1941 No.4's of British manufacture and North American examples. Very uncommonly seen nowadays. I have a "SM/41" marked example of this early sight on my BSA made rifle s/n 611 dated '41 on buttsocket.