I've had this for a long time and it was played heavily. I lack the manual or box, but this version of the game itself is of interest.
I debugged the game to find a build date of 98-10-21, which is only found on v1.0 cartridges. Similarly, certain glitches that are exclusive to v1.0 are found on this cartridge. The front label reads "NUS-CZLE-USE", which I believe is typical of either v1.1 or 1.2.
As far as I know, v1.0 gray cartridges are extremely rare in comparison to all other version of the game. The game is completely functional and the battery save still works. Is this worth anything?