Help with this shirt

[thunderw21]

This is my first 'vintage' shirt but I don't know what vintage. I can't seem to decide whether it is 1930s-1940s or 1970s, though I'm leaning towards the former.
It has high armhole, a long pointed collar, french cuffs, a 'pleated' back (see pics) and an interesting fabric pattern. It is in nearly perfect shape and was hanging in a rack of 1970s clothing, which makes me wonder.
Edit: it is an "Ambassador" brand shirt and was woven in England.

Can any of our shirt experts help?

Thanks.

 

[Baron Kurtz]

I'm guessing 1940s. Close-up of the label (that one isn't really close enough) and buttons, please. And the pockets, if possible.

bk

 

[scotrace]

Agreed. Still, the button-through flap pockets combined with French cuffs makes one wonder?

 

[thunderw21]

As requested:

The language on the label also strengthens my belief that it's a 1940s shirt.
Thanks guys.