battery change kit for prototipo chronograph

When your Prototipo Chronograph is ready for a battery change, use our custom caseback screwdriver to safely remove the hexagonal caseback screws without stripping them. Please note this kit is NOT needed for year 2020 and newer Prototipo Chronographs with flathead caseback screws. Kit includes the custom caseback screwdriver and a fresh Renata 394 battery. Be sure to consult your instruction booklet for additional information on changing the battery.