Enfield No4 Mk 1/3 Marking Help (picture heavy)

Lee-Enfield Rifle No.2 Mk.IV* and .22RF No.1 Mk.III

ENFIELD NO 4 MK I RIFLE Caliber .303 Original Condition with free sling and clip! – Royal Tiger Imports

GUNS Magazine Number 4 Lee-Enfield Rifle - GUNS Magazine

Ishapore .303 Enfield - Barry Lewis

Simulator No. 3 Mk. I made by J.W. & S. Ltd

No4 mk 1/2 Fore sight blade

Lee–Enfield - Wikiwand

Lee-Enfield, Gun Wiki

Sold - Milsurp Sale - Mosin M91 (Finn capture), Enfield No4 Mk 1/3

Looking for information on No. 4 MK 1/3 marks

Listing not Found

SMLE no 1 mk III has DP mark. Probably not safe to shoot right? : r/milsurp