Sorry the picture isn't clear enough for you. You should buy a brochure for your model year. You noticed the air filter box! Yea, the early cars didn't have decals. You see, there is no such thing as a "series one". So, there isn't "correct" across the range of construction refered to as "series one". Our term "series one" is a club term. Datsun never usde the description "series one". The early cars had black distributor caps and the later ones had the dull green cap. The replacement part is the dull green cap. Years later, the cap was constructed with aluminum contacts. The aftermarket caps all had aluminum contacts. That's why people like Arne still have the original cap. The original bronze (maybe brass?) contacts didn't wear out. One of the little things that made Datsun durability famous. You also want to make certain the cap is an original manufacturer and not the aftermarket. A search through the archives will reveal conversations Bambikiller had about this topic.