It might look unassuming, but this is indeed a prototype of Super Mario Bros. for the Japanese Family Computer System (Famicom). Purchased via Yahoo! Japan Auctions on Dec. 1, 2019, this cartridge was found in a video game store in Kyoto, Japan, which is where Nintendo is headquartered. The data inside features a retail build of Super Mario Bros. dated August 1985 and bears unique indicators suggesting it might have been used in manufacturing or quality assurance prior to the official September 1985 release. PSA’s Grader Notes specifies, “Affixed to the front of the cartridge is a typewritten label with information specific to the game. A rough translation shows that this is an ‘HVC cassette master’ - HVC was the product code for Famicom games in Japan, and ‘cassette’ is the word typically used to describe a cartridge.”

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