Questions for Capt. Laidler on late Fazakerley No 4 production:

[Mk VII]

I used to have A15579 which was marked F57 FTR just like this.

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[Calfed]

I used to have A15579 which was marked F57 FTR just like this.

I've got A15573 (6 numbers off), marked as 1955. To me, this adds credence to Capt. Laidler's explanation that a new receiver was given an existing serial number of a rifle that could not be rebuilt.