A true grail in the video game collecting space, whether you collect graded sealed games or just loose carts.
Nintendo World Championships (NWC) was a nationwide video-game competition held across 29 U.S. cities in 1990. The more common gray carts typically go for $50-75k nowadays ant auction and have around 100 confirmed owned out of 350 that are numbered.
The Gold NWC cartridge was given away exclusively via a Nintendo Power contest. The gold shells were custom-fitted with existing NWC gameplay boards, and a label was applied. The giveaway for the gold NWC cartridge was limited to only 26 and only 13 are confirmed to be owned.
The latest public sale of a NWC Gold was a CGC 4.0 copy without the label for $207k. Previous to that sale, the last public sale was in 2015 on eBay for $26k.