Faz 1959 made L1A1

[Lee Enfield]

The serial number indicates that 53,118 L1 rifles were built at FAZ by 1959...

I would suspect that if the F59 marking at the magazine well is real, that someone at Enfield F'd up the E in the serial number coding.

Although the F59 at the serial number looks different than the rest of the serial number.