Clock Balance Staff for Le Coultre A-11 aircraft clock

[Danny Fitzgerald]

I am in need of a balance staff for the following:
AF U. S. Army Type A-11
Movement by Le Coultre 7 jewel unadjusted. I can't find any numbers on the movement.
Information inside case: Longines Wittnauer Watch Co. Inc and a stamped 26187
Outside of case: ?.S.S.C. No. 88-C-583

thanks to any and everyone as to where I may find the staff part number or where to purchase.