The battery cover has a small seal hidden in the edge and the plastic display cover is sealed with a water resistant silicone. They made the first ones with Roman numerals and after a while they changed that to the more common hour-markings. These knives are real collectors items. Depending on the condition, type of numerals (Roman numerals are the early type) and type of knife... Victorinox discontinued the analog clock in 2007, since the digital clocks were smaller, easier to integrate and had more functions.
It is fairly easy to change the battery. Before you can do this, you need to pull the clock out of the scale. You can do this by pulling the small button of the clock towards you while you hold down the knife. Once the clock is out the scale, you can start prying the small battery cover of the back.The battery is placed face down and should fit nicely. Once the cover is closed, you can set the clock by pulling the button outwards and twisting it. Same method you use with every other watch. The Supertimer is a Swisschamp with the clock-scales and the Timekeeper a Compact with the clock-scales... The back of the small clock has "no jewels" engraved. This refers to the Automatic watches, which use "jewels" to minimize resistance between the gears. Victorinox uses a quartz-operated type of clock, which uses a quartz crystal to create an electronic pulse and has no need to use the jewels, since this works electronic instead of mechanical.
The item "Victorinox Swiss Army Knife Timekeeper Vintage Collectible / New In Box / Intact" is in sale since Friday, November 16, 2018. This item is in the category "Collectibles\Knives, Swords & Blades\Collectible Folding Knives\Modern Folding Knives\Factory Manufactured". The seller is "alphaautoglass" and is located in Hillsboro, New Hampshire. This item can be shipped to United States.