SnowgooseflightIt's a lot simpler if you just remember:-
3 hands = two timezones with hour hand going round the dial every 24 hours
4 hands = 3 timezones with main hour hand going round the dial every 12 hours and the 4th hand going round the dial every 24 hours.
Just choose accordingly (I recommend the 3 handers aka the purists) :)
Can you please correct this part of the description:
12-hour sweep hour hand for 3918.18.LBK8, 3918.19.LBK9, and 3918.196.LBK7F