[morzh]

I would simply re-cone the speaker. If you really think that you will hear it as near as possible to the way it was intended to sound in 1946, I have to disappoint you - you won't.
These speakers were in essence modern ones and do not sound a whole lot different from a speaker of the same type from 1960-s.
You will receive nothing but the cone (and possibly spider as the come together) of a proper size that is not likely to drastically change the acoustic characteristics to such a degree that, given the radio it is driven by you would notice much.
Also if you bought an original speaker, the speaker will be 75 years old, and that alone also changes certain things so, at least in theory, it won't sound as it did in 1946.
Plus you might have small rips (like I have) or de-centering, or....or and those all will require mending, and those things will also alter the sound somewhat.
I strongly recommend re-coning; also you are likely to pay more for the speaker than for the se-coning.