This is an estimation, but the items are numbered in order of age. 【Early Model】 Exterior: Shrunken leather, Interior: White, Zipper: TALON 【Late Model】 Exterior: Horsehide, Interior: Black, Zipper: YKK This model is believed to be the late model. The horsehide exterior is the same type of leather as the current Mexican-made SM58 pouch. The interior is navy blue. YKK is a high-quality Japanese zipper brand currently used by Louis Vuitton and others, and its durability is excellent. If you choose based on practicality, the late model is better.