The best version on the market now is PPF, some people say it is ZF, which is also correct, PPF is a subsidiary of ZF. On the V2 model’s dial, the power reserve indicator, positioned between 10 and 11 o’clock, is now functional. When you pull out the crown and wind the watch, you’ll see the small hand in the power reserve indicator gradually move toward the “48” on the far left. Once fully wound, the hand stops at 48, and PPF claims the power reserve lasts up to 48 hours. The V3 version only has an upgraded buckle, nothing else has changed