@rjames from the 75MY training manual.
Click to view attachment there is evidence that cars for california market ended up sold new in another state.
we have one on record as a 74 1.8 EC-a (california) that was sold new in Ohio.
i'm guessing they moved stock around the country if they had to. for instance if a buyer wanted a particular color.
maryland only had the bumper guards, not the calif spec emissions.
your car likely did come from maryland but was diverted to satisfy a particular order.
the only limitation on that would have been you could not sell a 49 state car in either california or maryland, but you could do it the other way around.