Graf Zeppelin LZ129 Hindenburg Automatic Watch with Power Reserve and 24hr Subdial 7060-4

hello and thank you , what does the gauge at top of dial tell me ? i like the watch overall . my Longines was stolen in housebreak. i need new one.

Does this watch feature a hacking movement?

Is this a mens watch? Does it have exposed back?

Does anyone that purchased this watch (7060-4) know if it needs a battery? Product info says it does, but it's supposed to be automatic.