My bad it seems it is for the EUR NES.
Since Camerica still lacked license to produce NES games, they had to create their own cartridges
that would bypass Nintendo's lock-out chip. Like the circuit used in Color Dreams cartridges, the
Camerica lock-out defeat generated glitch pulses that froze the chip. The cartridges they made were
shaped slightly differently from Nintendo's cartridges, though they still fit in the NES. The most
notable difference however was in color: all Camerica cartridges were gold and later silver. They
also featured a switch for play on European NES consoles.
http://en.wikipedia.org/wiki/Camerica