We all know (or most of us?) which different rear sight models have been fitted to the No.4 rifle over the years, but I'd like ot know more specifically which models ROF Maltby actually fitted to rifles when they originally left the factory.

Some we can obviously discount like the MkV micrometer or the CMkIII sight.

I also know for a fact a great many Maltby's left the factory with the MkII 2-pos flip sight.

What I am not sure of, as I've never seen non-FTR'd Maltby's equipped with anything but the MkII flip, is whether they left the factory at times with the Brit MkII or MkIII slide-elevation stamped sights (the ones with the spacer collar) or whether they were ever fitted at the factory with the Mk1 micrometer sight?

I have a non-FTR maltby with the MkII flip and for practical reasons I want an adjustable sight on it, but would prefer to use something that plausibly could have been on the rifle from the get-go.
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