Long Branch Mark 1 Singer micrometersight for No. 4

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albertacowboy

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I am searching for information on the makers' marks stamped on the upper left corner of these sights, to the left of the elevation adjusting screw head. I have 1 91L 1950 LB no. 4 which has CAL stamps on the rifle, similar to my 95L LB No. 4. However, the correct sight for this vintage (91L) would be the C Mk 3 pinch-slider CAL-marked sight as exists on the 95L, rather than the Mark 1 Singer-type sight which is on the 91L sight.

The sight on the 91L has a very large battle sight aperture, similar to the one on my Fazakerley No. 4 Mk. 2. I do have a LB Singer-type sight in my toolbox, but its battle sight aperture is small, the same size as the sliding aperture on the CMk 3 CAL sight on the 95L. Is it true that the LB battle sight apertures on Mk 1 and 3 adjustable sights were small-aperture only? If so, then I suspect the large-aperture battle sight of the 91L's Mk 1 Singer sight marks that sight as a British one, and I will replace it with the LB Mark 1 small-aperture sight in the tool box.

The above may seem confusing, but all help appreciated. The Singer sight currently on the 91L is not finished as well as the LB or Fazakerley sights, and I cannot decipher the maker's stamp.

Albertacowboy
 
Lol you're right, I'm confused.

Singer made different sized apertures, my cheat sheet listed SM41, 42 & 43 as small aperature and N67 as large. I might have that backward, wrote it down for the same reasons you are looking and it's been a while ;). They also used a couple different font types and sizes.

I've seen a few LB rifles with the RIL (?) Jungle Carbine sight too, another very large aperature.
 
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Sorry for any confusion. I suppose that my main question is," Did Long Branch make any Singer-type No. 4 micrometer sights with a large battle sight aperture, or did all such LB sights have the small aperture battle sight?"
 
I think at some point the battle sight apertures were drilled out, presumably to get a quicker sight picture in combat. Seems to me I heard that somewhere.

I don't know who made the 41 LB Mk I sights. I actually thought the factory did.
 
albertacowboy said:
Sorry for any confusion. I suppose that my main question is," Did Long Branch make any Singer-type No. 4 micrometer sights with a large battle sight aperture, or did all such LB sights have the small aperture battle sight?"
Click to expand...

Most or All wartime mkI rear sights were manufactured with the small aperture.

I have seen the instruction issued to ream the battle apertures, but IIRC only if the user complained, or the rifle was returned for servicing/repair.
 
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