That looks like a very nice bike!
I have seen a headtube like that a few times with the pionted lugs. I had a bike previously that looked very similar to this one but it was an earlier one.
Look behind the seat cluster at the back where it's split and see if you can see three numbers. If you can then Norris Lockley would be very interested to see it.
The thin piece of metal behind the bottom bracket is for the end of a pump to sit in. One strange thing though is the non French threading on the bottom bracket.
But there is a chance it could of been rethreaded when it was chromed.
For the moment i'm going to guess late 1940s.