"ERA" trademark. Whose is it?

[303british]

I am trying to do some background research on a 7.62 rifle Its stamped ERA above the serial number but every time I try to search on 'tinernet I get a zillon responses similar to :- Beatles or Gladstone or Jurassic....era. . Regards JJ

If its a No4 action chambered for 7.62 Nato then:-

Its not a trade mark, it stands for:-

ERA (Emergency Reserve Arm) ... Held as war reserve.

All the best,

Malc