Fazakerley markings were always extremely poorly executed and could often not be read, and were regularly renumbered. Peter Laidlerwrote about the ID problems as an adendum to a long article on the 1950's Fazakerley FTR programme :
Extract :
As for the markings, well, as I have said before, the shallow, almost invisible pantograph scratch markings caused all sorts of headaches for Armourers and thousands of these almost invisible Fazakerley re-numbered rifles were later re-numbered with the 'lost' number format of SA60 A1234 and so on. One seen only last week reads SA63-A2253 indicating Small Arms, 1963 with the sequential number A-2253 while underneath a number that reads something like 53P xxxxx follows!"