Recently there was some discussion of a Lyman receiver sight #54 so I leafed thru my modest collection of Lyman catalogs. Nothing to add regarding #54's.
But I did find the 1947 catalog an interesting read regarding tang and receiver sights.
Old knowledge to some but new to others.

Pretty cool , old catalogues had some really good information in them, thanks for sharing.

I learned a lot. Great post, thanks!