Hi
@Clarner , and welcome to the forum (-:
@The French cycle workshop currently has the bicycle for sale here (I have no connection with them).
À 1918 WW1 Columbia Westfield Military Model Bicycle. Recently found in the Ardennes region of France is this Columbia Westfield. It has the frame number J15449 under the bottom bracket making it a 1918 Model. As seen it’s not complete however I believe most parts are available through members...
thecabe.com
As you say, it's a nice find, but missing a lot of difficult to find parts.
Best Regards,
Adrian