Up for sale is a fantastic 1972-73 Mopar Air Cleaner with a 440 Trap Door Breather Emissions Under Hood Accessory. This high-quality air filter housing is designed for oval-shaped air filters and features some incredible elements such as a trap door and emissions system. Made by Chrysler, this accessory will help you get the most out of your car, especially when driving in difficult conditions. Whether you need a replacement or a new addition to your car, this air cleaner will not disappoint. 

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Looks like someone had hanging up as a decoration.  Estate sale find.  Not an expert on Mopar items.