Portofino Automatic 3563 range

Newbie Here just wanting to understand a few things about the older Portofinos. After searching extensively online I still am confused between the 3563-03 and the 3563-07. My concern is heightened in that I have just put a deposit on the 3563-07 in an AD in Torino, but haven't been able to find much information about it. If anyone can point me in the right direction and provide assurance that I'm not buying a dodgy watch that'd be great! This is my first watch purchase and I'm looking forward to being a proud IWC OWNER