Oh man does that bring back memories!
They used to have them for sale in the five and dime stores on a stand up cardboard display up by the cash register so you could pick one up as you paid and left the store. I remember that abut every second or third person in the late 1950's had one on the keychain. It may have been the most popular keychain pen knife in the late '50's.
As for actual use, they worked surprisingly well. The sheep foot blade was ground in an almost scandi grind and could be honed on the bottom of a coffee mug. The screw driver worked, as did the bottle opener. Anywhere some cold brews were being popped, one of these was sure to be seen. The nail file was a. bit crude but worked, and the little hook think that was supposed to be a nail cleaner was a great knot untangler. They were light weight, very low cost, and did what needed to be done. Whats not to like?
The people that are non knife people today but buy SAK classics because they realize they need something, but don't want to be bothered with anything big or expensive, are the same kind of people that bought these Trim keychain multitools.