The houses on my street built between the late 30s to almost 1950--I grew up in a rural area where nothing modest was built in the depth of Depression, and was also an area that was behind style-wise, and my sister's old house (largish, 1939) had escutcheons like this:

There were mixes of glass knobs and metal knobs in the same houses. My sister's metal finish was nickel or chrome, on my street it was raw brass, and they were probably inexpensive stamped brass not cast. A fancier earlier deco house may have had something more like this:

I don't know why the pictures won't show up, I did it the correct way. In any case look at the Deco, Streamline sets at Crown City Hardware

Thanks, I can't see them either! Thought it may have been my computer! I'm actually in the UK - is this site US based?

Yes. US company .

If I can attach the photos, here are two from my 1932 house. Some knobs are glass, some metal.

The bottom ones are just like the our original knobs in our house built in Wyoming in 1938. So I would say either style could fit well in your house. Oh and at least our local locksmith says he can make keys for our locks if we remove the lock/ door mechanism and take it to him.

I fixed the pictures and they seem to show up