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Mapco and Frigidaire were not directly connected, but they were both owned by the same parent company.
Frigidaire: After decades of being owned by General Motors, the appliance brand Frigidaire was sold to White Consolidated Industries in 1979.
Mapco: In 1984, MAPCO announced it was selling off some of its assets to concentrate on its core businesses. White Consolidated was identified as a purchaser in one of these transactions, buying properties for $171 million.
In 1986, the Swedish home appliance company Electrolux acquired White Consolidated Industries. With this purchase, Electrolux gained ownership of White's various brands, including Mapco and Frigidaire.
I think this points to your compressor being a replacement after the 1984/1986 ownership transfers.