This is a blue 58mm Classic SD with United States Air Force seal on the front, instead of the Victorinox Shield.
As you can see the scissors have the adjustable screw pivot. Victorinox stopped using those in 1991 (they use rivets since then), so this knife is at least 25 years old!
external links: SAK Wiki
This is a red 58mm Classic SD with United States Marine Corps seal on the front, instead of the Victorinox Shield.
As you can see the scissors have the adjustable screw pivot. Victorinox stopped using those in 1991 (they use rivets since then), so this knife is at least 25 years old!
external links: SAK Wiki
This is a black 58mm Classic SD with United States Senate seal on the back.
external links: SAK Wiki