Who's to say it's not an n and you've got it upside down?

Not sure... check this one [<<linkage} out! tell me what you think.

don't know what the U is for but it's rather interesting i'll see if i can follow your investigation on finding this out ^^

theres no pin or any of the other stuff that's normally on the end of a bullet... very strange

.22 does not have it at all. Because they are producted from really thin metal, and does not need a special "route" to be fired, like conventional bullets, like .50 caliber and 5.56 rounds ^^

ah, well how about that. i've only ever fired .380 and up so ive never really payed any attention the the .22

suppose thats what i get for assuming all bullets are equal :P

I fired much .22 rounds, it's quite good caliber to making fun or for Urban fights in close range, its cheap, and you can carry many of them.

But they have shit-or-less penetration when u fire it to flak jacket or other protective clothes. :P I tested on myself using an old army vest from 3 metters. That was stupid yea, but i was a little drunk xD That was not so powerful hit at all.

My only guess was that it was the mark the hammer made, but since you said it wasn't fired...

I think it's the company's logo or something.

It's a manufacture signature.

I know that >> but who is this manufacturer?:P

I searched a little but it was too hard to know that from internet. Ask about ammunition manufactures close to your location? (50-300km)

according to http://cartridgecollectors.org/headstampcodes.htm it was made in Utah or Connecticut

http://www.oldammo.com/march04.htm has a very similar bullet just not sure what make it is exactly from it's seeming to be such a common marking. Many folk've come through my city many from other countries such as eastern Europe.

Seems like it could be an "n" instead of a "u" ... which gives the following possibilities:

U - Kimberley Branch Mint, Kimberley, Republic of South Africa
U - Remington Arms Co., Bridgeport, CT
U - Rheinisch- Westfälische Sprengstoff A.-G., Nuremburg, Germany
U - Union Metallic Cartridge Co., Bridgeport, CT
U - Utah Ordnance Plant, Salt Lake City, UT

N - Birmingham Metals & Munitions Co., Birmingham, UK
N - Dum Dum Arsenal, Dum Dum, India
N - National Cartridge Co, Belleville, IL
N - Nitrogen Budapest, Budapest, Hungary
N - P.W.U. Fabryka Amunicji, Skarzyskó-Kamienna, Poland Note: PWU stands for Panstwowe Wytwornie Uzbrojenia (National Factory of Armaments). N usually shown as Norblin the metal supplier
N - Rheinisch-Westfälische Sprengstoff, A.-G., Nuremburg, Germany
N - Unknown Factory, Found in Central Africa

Hmm... since it looks oldass, I guess it can be a South African Mint... There are more precise informations here: http://www.dave-cushman.net/shot/30.....eadstamps.html and damn man, THIS BULLET OF YOURS IT'S FROM SOME YEAR WITHIN 1939 AND 1961... I guess the manufacturer broke up in this time... hmm... looks like you got a relic...