Rear sight guards for no1mk3 query

[RJW NZ]

Sorry I've been all over these posts just now, I've been head down and *** up for weeks and I can relax a bit ... so where else do I go on a rainy day but right here ... wouldn't have it any other way.

Re rear sight guards for the no1mk3; the right side of them has an odd double step up and out in the metal to make room for fingers to work the windage adjustable knob. When the windage business was done away with, did the sight guard lose some of those step outs seeing as that room for fingers was no longer required?
I'm restoring a project and am wondering if I remember seeing some sight guards that look narrower from others, or if I just imagined it? And on that related idea, about when did they stop getting made with the lightening recess? WW1 wartime expediency circa 1915 perhaps?

thanks

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