There should be a date code on the rear axle allowing a pretty accurate date of manufacture for the bike. I would say from the ammount of BSA logo'd parts that you bike is pre 1957 when Raleigh took them over, I would have thought that a bike of that vintage would also have a BSA chainring perhaps that has been changed out at sometime in the past, the gear change lever with the little indicator window is also a period feature.... A lovely bike.
385XZA