This lock has been in place since at least 1940, working as it should. I should clean it up and polish the brass but I do like the patina and aging shellac.
The company is still around making door locks and security products. Their history from their website;
ERA has been manufacturing and supplying quality security products for over 150 years. Situated in Willenhall in the West Midlands, ERA’s 1.5 acre site is close to all major lines of distribution, which ensures the requirements of customers located anywhere in the UK, as well as overseas, can be quickly met.
Well, that's about about as dry as can be, Comprehensive history here, (warning) it's not much better.
No mention of logos over the years but I much prefer the old one to their current modern look.