Thanks for starting this conversation, I have tried to highlight some of the categories that might be included in the definition of a Gentlemans knife, and have posted your answers into the form, followed by my personal opinions.
> So, my person definition of a gent's knife is
1. length:
a folder of about 3" (a bit more might be tolerable, and a bit less is perfectly fine),
2. blade style:
generally a slim blade
I'm OK with a drop point or a clip point or a Wharncliffe but not a tanto of any sort, nor a gut-hook nor a "skull crusher"
3. construction materials:
made with exceptionally attractive materials (some people demand all natural, some of us are perfectly OK with a well executed carbon fiber or G10).
damascus
4. opening style:
Personally, I think autos are out. I'm OK with assisted opening knives and some people aren't.
5. blade locks:
I'm also OK with a locking blade (my personal preference, actually) and others say no, only a slip joint
6. aesthetics:
I'm looking for elegance here, timelessness.
I'm talking about a dressy knife
7. Folder or fixed blade:
Folder only
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My criteria, open to evolving as my understanding deepens
1. length:
a folder of about 3.5" or less
2. blade style:
spearpoint and pen blade with less than 3" long cutting edge
no wharncliffe with cutting edge longer than 2", no clip point blade with cutting edge longer than 2", no tanto point, no dagger points, no serrations
3. construction materials:
damascus blades, carbon steel blades, mother of pearl handles, stag handles, ivory handles, bone handles
no synthetic grips (especially not with finger grooves), no lanyards (because these are for quick access, a self defense category, or a working mans knife, but not needed by a GentleMan)
4. opening style:
nail nick or long pull
no thumb studs, no thumb holes, no flippers, no autos, no assisted openers, no switch blades
5. blade locks:
No
6. aesthetics:
Qualifies as pocket jewelry due to materials of construction
7. Folder or fixed blade:
Folder only
8. Not designed for self defense, not for fighting, does not make people afraid. A Gentleman's knife should let people that see the knife believe that the person with the knife is a Gentle Person.
Thanks to those that have posted photos of knives, it always helps to see a picture.
The William Henry is a beautiful knife, but the dagger blade shape is scary, and the thumb stud and lock make it a tactical folder, capable of being used for self defense, by my criteria. It is also supplied with a sheath that has a pocket clip, which makes it a quick access single handed opener, all of which are self defense categories, to me. Again, just my opinion.
I agree the Mnandi is a very good looking gentleman's knife, but the liner lock moves it into the tactical category for me, also just my opinion.
Both the Mnandi and William Henry are expensive knives with premium handle materials, but the blade shapes could be considered scary by some. The Henry has a Mokume bolster and Damascus blade, which really dress it up. IF pulling them out at the dinner table in a restaurant, or in front of employees or clients in an office setting, does not scare anyone, then they are Gentle.
Here is a knife I consider a Gentle Man's Folder, my Case Damascus Stag Peanut. My reasons are that the Stag and Damascus materials move the knife into the category of pocket jewelry.
I don't think this Clip Blade with 2.5" cutting edge, qualifies as a Gentle Man's Folder because it might make some people afraid it could be used as a weapon, even without a lock, no thumb stud, and no pocket clip.
OTOH, I consider this Ebony handled Spear Point does qualify as a Gentle Man's knife because it is not likely to cause someone to fear it would used as a weapon, due to the shape of the blade. I also consider Ebony an exotic material, that moves it into the pocket jewelry category.
I guess my bias is whether or not the public would perceive someone with a knife as Gentle, or potentially threatening. If the knife is non threatening, it could be a GentlePerson's knife.