Google around a bit. These match what I have: Brass / Chrome Cabinet Hinges I doubt they are marine so cabinet hardware sites probably carry them too.
Most of the interior cabinet hinges I've run into are standard kitchen type (mostly the European style on newer boats), available on-line or at most hardware or kitchen and bath suppliers.
hinges They are amerock hinges model 7697 I searched the internet and found them. I'll try to find my reciept for the name of the store.
I know this is an old thread, but I figured I would update in case anyone is in search. Amerock is no longer supporting the 06L hinge that is in many of Post's cabinets. A few companies seem to have cross reference hinges, Blum. Grass and Liberty, but if you want that exact hinge, you can contact Stan the Old Hardware man. <-- Google it. He has the cups, but the two screw hanger that my Post has are all gone. so, that means that I have to switch to a 1 screw design, that Im not thrilled with, but its better than re-routering the door hole. Just FYI. The part for my 50' is an Amerock 06L 3/4 overlay 2010 - 31 cup.
Since you're in WPB, try Seafarer Marine in Fort Lauderdale, they stock lots and lots of interior hinges.