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Those are the earlier Nervex lugs, so think early 50s. The brazed on cable guide over the bottom bracket may well be a later addition because those sort of things tended to be band on. May be a 70s addition when over-bracket guides were popular.
The paint looks very thick. Original paint was thin enough that it picked out how well the lugs had been cut - it was something the more prestigious frame builders were proud of. On a Bates I would expect custom cut fancy lugs, but they might have made some off the peg frames with Nervex lugs.
Have a look on the classic lightweights site frame builders section. You're looking for some telltale touches like the seat stays, lugs, fork crown; that sort of thing that the builders did to make their frames stand out. Yours doesn't have anything that stands out as distinctive, unfortunately, so it might be difficult to pin down who the frame builder was. Still looks like a nice frame though, even if it's not a Bates.
Trying to work out whether this is an original E.G Bates frame..
I'm wondering if somebody had re-sprayed the frame & used E.G Bates Decals... the nervex lugs look legitimate but those aren't to uncommon anyway. It is a nice low road/racing frame..
Thoughts anybody?