Got my Ontario Mk 3 Mod 0 US Navy dive knife today. First impressions

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Aug 3, 2012
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Well....I finally got a knife I have been wanting for years. The Ontario MK3 Navy dive knife. So I am excited...:D.

Anyway my first impressions are pretty positive with this knife. The sheath is a hard plastic design with with a spring clip in it to hold the knife in place. Locks in pretty good!. The sheath also has a string on the bottom of it for wrapping around your leg and a pistol belt loop at the top. On the sheath it says MK 3 MOD 0 USN.

On to the knife. Its 440A stainless steel. I guess that is what the Navy wanted...makes sense sense they are always around salt water. Comes with a metal handgaurd (I assume its stainless too)...and a solid hard plastic grip which feels really good in my hands.

It appears the blade comes nearly all the way down and the pommel is pressed into the grip and blade tang. The is a small phillips head screw with a riveted style back the appears to be screwed and pressed into the grip to reinforce the pommel.

BTW: This pommel is fairly big and solid. Looks like you could hammer a deck together with it. The blade came with a decent edge...I got something to work with. The false edge (its a double clip knife) is also sharpened. Which I thought was unusual from the factory. Never seen a Ka-bar or a USAF with a sharpened false edge from the factory. The point on the blade is pretty dang sharp....this thing could defiantly penetrate something right out of the box.

No fuller on this one....and the saw is a little peculiar. Its not like the saw on the USAF knife its a bit different and has different grooves in it....wonder if its just for cutting rope or something? Anyone know?

It has the Navy stock number on it right over the hand guard and on the opposite side it says MK 3 MOD 0 on the blade right over the hand guard. Both side of the grip also has USN stamped into it.

One thing that I like about this knife....it's the newer designed blade with a thicker tip. I heard the old ones with the more up swept tip were prone to breakage. Anyway I called Ontario to ask them about the saw and the grooves in the saw blade. They told me that they are not sure what or why the Navy had it designed that way. Then I asked if they still make these for the USN. They said yeah...they still make and sell these blade for the Navy. So I guess that is pretty cool.

Anyway I am really liking it so far. :) Not to heavy for its size either.
 
This thread is useless without pics. :)
I've got a Ka-Bar Next Gen in 440a, and it's a very very good knife. I've been rather hard on it over the years, and it has held up like a champ, with the edge extremely easy to bring back when the work's through. 440a with a good HT is under-rated, I think.

Get those pics. :)
 
I'm former navy and have had mine since 88. It's served me well and don't have any complaints. Some of the first things i ( we) did was loose the belt hanger and shoe laces. Para cord works better. I'm a little sad they changed the tip, with a good sharp blade and false edge it really stabs through anything. As for the blade coating coming off don't sweat it , mine is shinny from 20 plus years of use and sharpening. Also gives it a little of that been there look. Good luck with it
 
Its really cool to see someone on this forum get so excited over a relatively cheap & unexotic knife. I was surprised at how much I liked my new Ontario M3. The smell & look of the leather & the prosaic mid-20th century look & feel pushed my buttons more than some of my more expensive recent purchases. It set me on a military knife & bayonet kick that may chew up considerable funds before it loses steam.

I was planning on getting an Air Force Survival Knife in the near future but always overlooked the Navy equivelant for no good reason that I can discern. I guess I'll have to give it a try sometime. I really like Ontario for their cheaper offerings like these.
 
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My boss in 1987, and now long time mentor, gave me his Mk3 Mod0 he used when he was on an SF wet team. Last August I gave it back/mailed it to him to hold for one of his grandkids. That's where it really belongs.

It's a good knife, but I never used it, preferring the Glock Field Knife (81) instead which I used the crap out of. I don't think he really used it either other than have it with him while in SCUBA.

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I know I'm a couple months late on this, but I found my Mk 3 in the attic this afternoon after thinking I lost it years ago in a move. This was the knife I used when getting dive certified, and it is one of the best "bang-for-the-buck" blades I have ever owned. I remember first getting it and being surprised at how sharp it was out of the box ... the point was lethal. I'm no longer into diving, but the Mk 3 makes for an outstanding land-bound hiking/camping/woods knife. Now I just need to source a new sheath as the original really must have been lost as it was not with the Mk 3.
 
Well I know its been a couple years since I made this post. But I have to tell you this knife was worth the money. Its tougher than nails. It does take some time to get a good edge on it, but it is very rewarding when you do. I am still not sure what the saw on the back is for.

After doing some test cutting on a few things I can tell you this knife is tough. Wood, water bottles, etc. I am thinking about making it my camping/hunting knife. It isn't the sharpest blade but it is tough, versatile and dependable.
 
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