About Gumshoe

While the catalog number for the Canadian version is officially "NES-GS-CAN", the cartridge itself mere shows "CAN".
Likewise, the Great Britain/Italy version shows "GBR".
The Hong Kong version catalog number "NES-GS-HGK" does not actually appear on the cartridge. But this is known to be the correct catalog number from official Nintendo sources.
Likewise, "NES-GS-ASI" is not shown on the Asian version cartridge. But this is known to be the correct catalog number from official Nintendo sources.
Although the name "ガム･シュー" does not appear on any of the original game materials, other Nintendo sources do use this name.
"ガムシュー" is used unofficially.
The catalog number for the Japanese version is "HVC-GS". However, this does not appear on any game materials. This is a very obscure Japanese release.
"HVC-GS" is the also catalog number used for the Wild Gunman and Zapper set sold in Japan. "HVC-WG" is the catalog number for the normal Wild Gunman package.