IndyGear is pretty much the place to go, and even there they say there were 10 different variations from just the original version, but the gist is, the zippers are brass, the the straps have rectangular sliders as opposed to D rings. The actual pattern of the jacket, seems to vary slightly amongst all the jackets made, so it seems unlikely that the Raiders jacket is significantly different from any other in regards to the collar, storm flap or pockets. As the films developed the jackets became more consistent, but in Raiders it was more haphazard,