Gallet Multichron Navigator GMT

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Good day. I am looking for some help with my Gallet Multichron Navigator GMT chrono. I received this as part of my father's estate, after he passed at the age of 93. He was a paratrooper with the 17th Airborne in WW II, and later became a watchmaker. I wish I had known about this watch while he was still alive, because I would have loved to hear it's storied past. As you will notice by the pictures, it is missing the stem/crown at the 9:00 side. From what I've been able to find out, this feature was used as a second hand hack, and allowed the wearer to synch their exact time with a radio signal. The watch appears to be fairly rare, and I would love to be able to source the missing parts. Thank you in advance!