First advice, be patient. If you want to rush things, you're going to bring yourself trouble.
Secondly... Have you used the search function? You won't get very far just by asking. A little self research goes a loooooooooooooong way.
ALE's PAM guide is gold in this part of the forums and it's impossible to miss it.
I'm new myself and have only been looking extensively into PAM Subs and just a little on a few others but what I do know about the 112 is... There's really no telling it's a rep unless the guys in your office want to have a look at it off your wrist with an eye loupe. The main inaccuracies are the swan neck details, screw length, movement plate engravings and lume quality. But seriously though... You're NOT going to see any of that just by turning the watch over.
Inaccurate is an overstatement I'd say because they're 99% similar to gen if you're not magnifying things.
Gen vs rep comparison for 312 should be good for you to decide where the inaccuracies are.
KW vs ZF will be good to decide which factory you'd like to go with.
Between 112 and 312, the 112 is super rep compared to 312 being only first class. This is mostly because the 312 has a display caseback that shows the 7750 (or seagull) movement DECORATED as the P9000 and these are just NEVER going to be accurate. Again to be fair, unless you're taking the watch off your wrist for the guys in your office.. they would have no clue.
Before deciding which watch you want, decide your TD first and whoever you choose should be able to get you the watch you want - even if it's not on their website.
Welcome and good luck!
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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