The origins of this prototype are the subject of legends in collectors' circles. A person who goes by the handle "jollerancher" happened upon a motherload of awesome items at a garage sale of a former Nintendo employee. In this lot, there was a prototype for The Legend of Zelda: A Link to the Past. This prototype is currently owned by DreamTR.
Although this prototype has not been dumped, it is almost certainly identical to the final US version. ReadOnly broke apart the US Zelda ROM image, and found the checksum of the the first 4 Mb:
---------------------Internal ROM Info----------------------
As you can see, the checksum is identical to the checksum listed on the first chip of the prototype (0x179E). Now, it could be possible that the second chip has differences, but that is exceedingly unlikely, as it would likely affect the checksum of the first chip.
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