Long Branch No#4 Mk I*

[Pyros3]

I have what appears to be a Long Branch No# 4 Mk I* with all matching serials 1950 date in remarkable condition I was looking for help identifying it. Can post pics of cartuches or firearm if someone is willing to help.

Information

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[CODFan]

I am certain pictures will assist in providing comments.

The more detail provided the better. Serial number, bolt, wood, muzzle end, etc.