Valve cover differences

I am confused by the top photo. Is the black cylinder part of the valve cover or just the cap off a spray can sitting over the oil fill? The bottom photo has an extra "breather cap" which draws air from the air filter. That might have been part of the "clean air package" for CA only. They later integrated the breather cap and oil fill, which is what my 69 non-CA car had.

I understand the purpose for routing it to the air filter was in case one has excessive blow-by gas overwhelming the PCV, the breather would blow instead of suck and they wanted the overflow gas to get burned in the engine. I think later cars put a removable filter inside the air cleaner. If you ever install an after-market air cleaner, they usually have an optional fitting in the base for the breather hose. Until then, you could cap the hose off or fit an aftermarket breather in that valve cover hole.