Info on regimental markings on model 71/84

[CLB]

Hi, I have recently been given a Muaser model 71/84 that was my great grandfathers. I was just interested in any info that might be available on the regimental markings on the butt plate. they reead 50 R.R. with a 313 underneath. Thanks in advance for any info given.

Information

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[Tango Charlie Six]

I know this is way late. Go to cruffler.com, they have imperial regimental marking guide