Here's an absolute grail for any '90s action movie fan: @seagalofficial hero, screen-matched Gerber Mark II knife used in the classic Under Siege (1992).
Seagal used this knife during the unforgettable final fight against Tommy Lee Jones. Even today, it's still considered one of the greatest knife fight scenes ever filmed.
This knife was screen-matched using the serial number visible on screen. While a few of the characters are difficult to make out due to the image quality, it's a 100% match. You can clearly read J5640S. At first glance, the "6" almost looks like an "8," but the faded upper-right portion confirms that it's actually a "6."
Even more convincing are the distinctive chips on the right side of the handle, which match perfectly between the screen-used knife and the movie frame. Details like these leave no doubt that this is the very knife used on screen.
