Numbered serials starting with 1 indicated ROF Maltby, 2 indicated ROF Fazakerley and 3 indicated BSA Shirley.
The British made No4MkI’s use a prefix and number – (Alpha numerical) system to identify manufacturer. Now this only equates to British No4MkI here. To work out which factory that your Lee Enfield No4 was made is to look at wrist markings where the serial numbers are. The bulk being from the Royal Ordinance factory Maltby, ROF Fazakerley, BSA Shirley, with smaller quantities at Longbranch in Toronto Canada and by the Stevens-Savage company of Chicopee Falls, Massachusetts, USA. Lee Enfield No4MkI’s were made by several factories during the 2 nd World War.
