Markings on a No.5. Mk.1 Lee-Enfield...Question?

[drm2m]

I don't have any reference books that deal with the No.5 Mk.1. rifle.
Can anyone tell me about this marking?



Are the front blade sight markings generally .015 on these No.5 rifles?
What is the N67 marking?
I understand there were nine different markings for different sights on Lee-Enfields.



This rifle was manufactured by BSA-Shirley in 1945, Serial number BB9724.






Thanks,

David

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