Ambassadeur 2500C (A-A25-00C-0-048-U-C) An interesting Counter Balance Handle seen on an Ambassadeur 2500C. This handle was fitted on some Ambassadeur 2500Cs from October 1975 until it fully replaced the Twin Knob Handle in October 1976. Sep 1976, Nil Revision An undated schematic diagram from Garcia indicating the transition between Double Twin Knob Handle and Counter Balance Handle.