That looks like an early style aftermarket cover. It also has the early starter because it's got the large pinion / jackshaft bolt, 7/16" wrench size. I say aftermarket because it's missing the two gasketed support standoffs inside the inspection cover. Two of the inspection cover screws go through the standoffs on a stock primary cover.
Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .