According to Skennerton, both Savage and Long Branch No 4s were initially fitted with the Mk 1 Rear Sight. And like the UK production, the Canadian post war production reverted to the Mk 1 Rear Sight.
The Mark 1 sight is otherwise known as the "Singer" micrometer sight. These were made by the Singer Sewing Machine Co. in their Glasgow, Scotland, plant. (The "N67" stamp found on them refers to that plant. "N" stands for the northern sector for wartime production in the UK.)
For simplification, the Singer sight was replaced by the "L" shaped Mark 2 sight, and then later by the Mark 3 sight with the stamped slide.
It doesn't make sense that the UK-made Mark 1 sights would have been imported to the U.S. and Canada for the initial No. 4 production. More likely, even though the Mark 1 was the "official" specification, the North American production used the simplified sights until the Mark 1's could be retrofitted.
He has quite a few pictures of very early, very late, and war-time prototype Canadian made No 4s with the Mk 1 sight, maybe not made in Glasgow by Singer, but they are Mk 1 milled sights with screw-type adjustments. He also states very plainly that the first Savage made No 4s were fitted with the Mk 1 sight before switching to the Mk 2 sight.
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