That is definitely a V1, the 2 screws in the blade grips make the head a V1. The feathering shaft is smaller on the V1 than the V2 so make sure if you put different dampners in you use V1 or they will be loose. The main shaft is 5mm instead of 6mm on the V1 as well. To make a V2 out of a V1 you need to change the frame, fuel tank, most of the head parts, feathering shaft, bearing block, grips, bearings and a few other parts. The V1 also has a weak tail on the grips area, if you crash it grab up some V2 parts and re-do the tail with V2 parts. They are fairly cheap so even if you don't crash it I would pick some up and fix the tail.

I also thought the 50 used a driven gear for the tail instead of the red gear like the 30's, but not 100% sure on that. Maybe someone else know's this? To me that looks like a V1 30.