Ahead of changing the foresight element on the BSA 1945 T rifle mentioned in a previous post, I went to the references (Laidlericon, Reynolds and Stratton) and sorted my elements by type of Mark. I have 2 styles of Mk I, some Mk I*, some Mk II and a very few Mk III elements. There some I've called Mk Is with a vertical rear face of the base where the Mk I has a forward sloping rear face.

What I was not expecting was to find an equal quantity of similar but different elements. If the dovetail base on a typical No.4's sight is about 3/16th of an inch tall, what are the ones I've got with dovetails only about 3/32nds of an inch? Quite noticeably shorter, and all seem to have the transverse slot like the Mk I* and Mk III. Are these for the No.1 rifle or possibly CNo.7? My father had a lot of time behind the butt of a CNo.7 and could have picked up spares - as everyone seemed to do.
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