A lapel knife is a small, easily concealed blade often used by spies in WWII. It can be hidden in a lapel, as its name suggests, or it can be dropped into a boot, slid into a sock, or even hidden in a tie. 

My lapel knife is made from a high carbon steel circular saw blade. I cut it out with an angle grinder and shaped/sharpened it with a bench grinder. The blade is chisel ground, meaning it is sharpened on one side of the blade only, like a chisel. LOA is ~ 6.5cm, with 5 cm for the blade.

I'm not sure how the knife was originally intended to be held, but I hold it between my thumb, middle and index fingers, almost like it's a key. I DO NOT recommend holding it between thumb and the middle of the index finger. I tried it this way and got a nasty cut almost immediately.

Now, this is not a knife one would use to stab through a door. It's for quick, jabbing strikes to the face, eyes, and throat. Maybe some thug's trying to pull you from your car, and you give him one heck of a poke on the back of the hand. He's going to want to let go pretty darn quick. Also, as I mentioned in my Kakute ring 'ible, head wounds bleed profusely. If this knife opens a 6" gash in an attacker's forehead, the blood streaming into his eyes prevents him from seeing clearly, giving you time to kick is legs out from under him and get away.


I don't Know if you are interested but here is some information on the British SOE Lapel Knife from World War II
<p>Now, that is way more interesting than people telling us that carrying knives is illegal where they live. Dude, it's the internet...it wasn't necessarily written in your country.</p>
As a rider carrying this in most parts of the world would constitute a concealed weapon and lead to arrest of found.<br><br>In the UK they lock you up and throw the key away as knife crime is seen as very serious.
<p>That's why I'm glad I live in the U.S. We've have very few knife laws. Our government doesn't think of us as &quot;subjects&quot;.</p>
Yeah, well, I think knife laws are stupid. The UK's laws in particular. Since the weapon ban started, violent crime rates have gone up, not down. What they need are stricter regulations, not a blanket ban on everything from toothpicks to AKs.
Yes... <br>
Well said and a nice instructable. <br> <br>I have a number of old saw blades and this is a good use for some of them. <br> <br>The UK has outlawed guns so the thung use knives. There is talk of outlawing knives. What next, make illegal to own a baseball or cricket bat? <br> <br>I live in the South. Everyone is armed and everyone is polite.
Thanks. Last I heard, though, it was a good long stay in jail for carrying a knife without a valid reason. (valid reason being for national dress or a job that might require a blade)<a href="http://www.donrearic.com/tomyfriendsintheunitedkingdom.html" rel="nofollow"> Here's a very good article on the subject.</a>
In Spain our knife law is very restrictive, and it is being doing even more restrictive. <br> <br>The thug use whatever they want. If a policeman fine them (Euro 300 for a big or automatic or two sided knife) the simply say that &quot;I'm bankrupt, I have no work, I have no house...&quot; There is no jail or other consecuences. OK. Great. <br> <br>Mommys offender. They live better.
i have a 7 inch blade belt knife i carry every day. forged it myself. i also live in the southern US....polite, yet well defended. its a good way to live<br>
I guess this sums it up?
If both the bottom edge and the upper edge are sharpened it is called a dagger and it is a felony to possess a dagger in Florida and probably many other states as well. It is sort of a foolish law as the bad guys usually use guns these days.
And how much more damage will a blade with 2 edges do than a blade with 1? Either way, you've still got a few inches of steel in your chest.
how big is it in inches (I know its big enough that you could lay it on 4 fingers completely hidden)
Approx. 6.5cm/2.5 inches and change.
Circular saw blades apart from the teeth are generally soft material (mild steel) to prevent them flying apart - this also reduces cost considerably.<br><br>The tooth tip is a carbide material brazed or welded onto the mild steel.<br><br>IF the saw has integral teeth then generally these are locally hardened rather than create a totally hard saw.
its all high carbon steel. the teeth are just locally hardened, like you said. the rest is simply left un-hardened, to prevent it from flying apart...again, just as you said. but it is all high carbon, which is the only part you got wrong<br>

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Bio: As you have perhaps noticed, I have a fascination with weaponry. I particularly enjoy making and using old martial arts weapons, especially the meteor hammer ... More »
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