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The mag started life on a Fazakerly made rifle, though the mag itself could have been produced by a subcontractor.
As a hard and fast rule on wartime No.4 rifles:
4 digit serial numbers with or without a letter prefix are BSA.
5 digit serial numbers with or without a letter prefix and beginning with 1 are ROF Maltby.
5 digit serial numbers with or without a letter prefix and beginning with 2 are Fazakerly.
5 digit serial numbers with or without a letter prefix and beginning with 3 are also BSA.
Some rifles will have an "A" suffix. Do not include this in the digit counts above. the A suffix indicates that at some point one or more non-standard parts were fitted to the rifle when it was first produced. Often this will be as simple as an ersatz safety assembly without the bolt-locking helix.