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.