It was pointed to me that a good reference for modifications would be this set of drawings:
http://www.airwar.ru/other/draw/catalina.htmlSo it was early type i.e. one with rounded tail flush waist gun positions (well my PBY-5 wil now get dutch markings). And from last photo provided here green-black camo. Interestingly this plane is really a black hole in regards of information, photos, colour profiles etc. What bugs me that all internet sources say that GST was licence produced PBY-5 (reason for me getting that one) and not earlier versions.
Basicly i would have to get me an early version.