Which equipment it is for?. It is the mechanical part only, drive gear and 5 rotary number groups with 3, 3, 4, 4 & 4 digits in a 6" x 4" plate. Has the following nomenclature : A9 TUNNING ASSEMBLY 37695 ASSY 712599-901 MFR 20294 NSN 5820-00-402-5511 also 37695 712675-801 mfr20284 N00104-83-C-3255 S/N 280 Regards Miguel