I read this yesterday about some changes Nintendo made between pressing the gold cart and later versions:

Eventually the Muslim community complained that the chanting was in the game, and it had to be removed, along with the original Mirror Shield crescent moon design, which is also an Islamic symbol. The only way to see either one of these things now is by playing the original OoT Version 1.0, which amounts to all of the gold cartridges and only the very first gray ones.

http://www.destructoid.com/other-worlds-than-these-hyrule-in...

To be honest, I don't think I've ever seen the grey cartridge version of Ocarina of Time, at least not in Australia... I purchased my Ocarina of Time just around the same time Majora's Mask was released and I received a gold one.

I remember at the time talking to the salesperson at EB about if it was so limited edition, how could I pick order one easily after the release of the next version. He told me that he'd never seen a non "limited edition" (his fingers went up in the air to indicate the quotation marks) version.