Your best reference is [MENTION=35350]ALE7575[/MENTION] guide (one of the stickies).
Here is what he writes about the PAM 231 rep.
January 2014
H maker releases a rep PAM 231 J-series, with no perfect but very improved case Rose gold coated by DLC-like process (more resistant than conventional process), caseback accurate enough (no perfect either), with wrong fonts of PANERAI inscriptions and PANER_AI issue as usually.
Anyway the most visible flaw is the hour hand clearly wider and longer than gen and much wider than minute hand, whereas gen has both hands with the same width andhour hand doesn’t reach the markers. Most likely maker is using the hands of aPAM 232 which is a mistake.This is a noticeable flaw and, moreover, on dial.
This replica is a good and beautiful watch nicely manufactured, but as replica has evident flaws and on dial, we cannot consider it a First Class replica, good high quality rep and no more. With a correct hour hand it could get a First Class status bordering a lower one.
Get more info here:
http://forum.replica-watch.info/vb/showthread.php?t=170641 by Sharrkey
http://www.repgeek.com/showthread.php?t=222405 by AP_VC
http://www.repgeek.com/showthread.php?t=222630&p=2397213#post2397213 by theflyingdutchman
Pictorial and mini-review
http://www.repgeek.com/showthread.php?t=224857 by mike00