You are confused..........Your Father may well have encountered a Leigh Enfield #5 an example
https://tinyurl.com/yyt48ts5 ( although this listing has a number 4 image mixed in for some odd reason + another disturbing issue)
"before he was issued with a SLR," but I do not expect he ever encountered one of the examples listed on T.M.
They are are post war commercial modifications of the #5.
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