I have not heard of a Enfield No3....................
Models/marks of Lee-Enfield Rifle and service periods
Model/Mark In Service
Magazine Lee-Enfield 1895–1926
Charger Loading Lee-Enfield 1906–1926
Short Magazine Lee-Enfield Mk I 1904–1926
Short Magazine Lee-Enfield Mk II 1906–1927
Short Magazine Lee-Enfield Mk III/III* 1907 – present
Short Magazine Lee-Enfield Mk V 1922–1924 (trials only; 20,000 produced)
Rifle No. 1 Mk VI 1930–1933 (trials only; 1,025 produced)
Rifle No. 4 Mk I 1939 – present (officially adopted in 1941)
Rifle No. 4 Mk I* 1942 – present
Rifle No 5 Mk I "Jungle Carbine" 1944 – present
Rifle No. 4 Mk 2 1949 – present
Rifle 7.62mm 2A 1964 – present
Rifle 7.62mm 2A1 1965 – present
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When all else fails.
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