Like this, for those who are not familiar
https://www.bladeplay.com/item--Guard-Father-OTF--443I got one in Tombstone in 2016, I've used it at work on and off since then keeping in my shirt pocket. Being a mechanic, I use it for tasks like pulling O rings, opening boxes, scribing things, and prying at things like wire harness retainer clips. The utility overlaps with a pocket screw driver, but there are many cases where one is better than the other. I don't think many people actually use these beyond having it as a collectible novelty, and I on the other hand have used it. And it has held up and continues to work as well as it did new.
A couple things that seem important enough to mention, it is not a covert weapon when compared to much better options for disguised spikes/blades. A brief look at it will let anyone who isn't an idiot realize that is is not a pen nor a flashlight, but rather a weapon. It's much bigger than a pen and has an odd button, and that really gives it away. The pocket clip that spins to hide the button and act as a safety is also in the opposite position it would have been if it was a pen. I have handed it to numerous intelligent people who aren't into weapons and they immediately knew it was something of a weapon, even though they didn't understand how. I did put a stylus rubber in it out of a cheap pen, just shoved it right in when it was in the closed position, and it fit perfectly, and that sort of masked its purpose, but only just, and actually prevented the mechanism from deploying until I removed it. In a sense it's the worst of both worlds, not a covert weapon, and not an optimized weapon when compared to a much wider blade with a longer blade length for the handle size, though certainly it would do the job if someone was stabbed by it in the right spots especially a bunch of times.
It's not a particularly sharp and pointy spike. When I was a bicycle mechanic in my teens we used sharpened spokes as a tool. Much like these days I use a 4 piece pick set of about the same width. The Guardfather's spike is much, much fatter than that, basically a dull and fat profile, though sharp enough still to gouge and scratch things. You could sharpen it, though I never did and consequently can't say how long the sharp tip would last.
I think they are neat tools if you are in the blue collar trades, and a neat addition to a shirt pocket full of pens and other items, and they appease the weapon geek side many of us always have on our minds.
