Lee Enfield Micrometer sight

[gerard488]

Hi all.
I just found a "B" stamped rear sight with a broad arrow inside a diamond. I cant find any info online about the diamond, wondering what it could mean. Any help appreciated.

Information

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[CINDERS]

A bigger clearer pic would assist a great deal as enlarging this one it gets very pixilated

[Peter Laidler]

BSA post war contract to fulfill post war FTR programmes at Fazakerley (UK MIlitary) and at BSA (commercially) as I understand it.