Anyway to determine it a 1971 Flapper Assy is period or reproduction? It is a piece of plastic and wondering if it made it to 2024.
Im sure my W30 AIR CLEANER base is period.

 

Any numbers on it? I built some tooling in the early 80s for Mannn filter/Chrysler for their flapper, its mount and the vac piston, should be a small number on it, usually a 1 or 2, it represents the cavity number the part came from in the mold.