Is your cartridge a gold or a gray color?
Most version 1.0's are gold cartridges but there are some rare gray cartridges that are version 1.0 as well. The gray 1.0 are rarer than the gold ones.
For most people, this doesn't mean anything, but for some hardcore Zelda fans, they'd be interested in a rare gray version 1.0 cartridge and would probably pay a little more.
http://zeldaspeedruns.com/oot/gen...
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My WTB thread
Buying Zelda CIB NES/SNES/N64 games in mint conditions! (Both NTSC and PAL)
Also looking for Phantom Hourglass NFR Demo (PAL) and Twilight Princess NFR Demo (PAL)