I had a '39 trunk handle with no key and could not get the cylinder out to have a new key cut by the code numbers. One locksmith told me I had to turn the cylinder, maybe 90°, but I can't remember, and then push in on a spring loaded pin to get the cylinder out.
I wound up sending this handle to Leon Rowell. He somehow removed the lock cylinder, then cut a new key to the code numbers, all for a very reasonable price. He goes by "Locdoc" or "Lockdoc" on Fordbarn. You could look him up in the members list and pm or email him. He is excellent to work with.