Tweak Your Brain With Colors

This is a primitive hula hoop

A really old-school bicycle gear?

I've never seen anythng like this, but I guess what this could be used to - Looks like steel or cast iron to me, and it has those reversed letters protruding from the surface... This could be some rotating part of a press - you could turn the ring changing the numbers/letters that eventually get pressed against some softer material - paper, copper, lead.
Am I at least close? :)
Fun to do this anyway!

I believe this is the toughest looking dog collar ever. Spikes? Psssh. This is for the dog who knows who's boss of the dog yard.

This is a stamp tool.

I think it's a complementary piece in a mould used for the injection of melted plastic materials.

A stamp tool for a lunar calendar ?

A Klingon frisbee.

im always too late... its some sort of stamp.

key used by the Egyptians to control their Stargate :o)

metal punch/stamp

I believe it is to hung on a small valve on the rising stem part of the shaft to indicate when it was turned on or off by the controlling authority.The valve would be for gas or water.

It's a stamp tool used to put numbers and/or letters on antibiotics and other medications.

Looks like it is used to make chains.

it has characteristics of a spark plug gap tool, but obviously it's not for spark plugs because it's measurements are far larger than needed. i'm at a loss. it's photoshopped!

This is a mold insert for adding a datestamp to manufactured goods. You slot the insert into the mold in the proper orientation, and the date shown is molded into the product. This particular model appears to be from 1956, since the dates run are of the form "m-yy" and the yy is 56.

tug-of-war. Tug-Of-War. TUG-OF-WAR

It looks like it's attached to a cog to increase it's size. The inner teething are about the same size, but it increases the width between teeth.

Well, that's my guess.

I knew this one right away. It's an ancient Hawaiian Lei from the Iron Age. It's in really good shape, but heck, those things lasted forever.

its what i use when i can't find my brass knuckles.

Everyone knows that's a Spacely Sprocket.

I believe it is a ring to be hung on the rising part of a small stem valve for the control of water or gas by some controlling authority. It can be read backwards by the use of a mirror.

It's like a stamp, but not really. It's used for etching a number into metal. You put the desired number face-down on whatever you want to brand, then whack it on the back with a hammer.

LOL @ #21

Iron Man's wedding ring. The date is imprinted so he can't forget his anniversary.

It looks like it would go on an old printing press

It's a contraceptive ring for the new female Terminator models.

It's a pill press.

Looks like you use it to strip kernels off a corn cobb. Heh, course I can't tell its size. Maybe it's for a REALLY big corn cobb...

Calculator

Nerdy branding iron.

It's not a Spacely Sproket, it's a Cogswell Cog!

It couldn't been used for dates or months because the caracter are fixed, and are 15; then maybe it was used to stamp the size of some tool like 01/56 or 15/56

May I just say that this is the Hardest Nerd Game that you can't sick a computer onto.

and yes it is a Cogswelll Cog.

or maybe a tooth condom with a big hole

It’s part of the Enigma machine!

Unfortunately the name of this little beauty escapes me at the moment, but obviously, just from looking at it you can tell its creator was a visionary, the provocative bumps and flat finish are a combination rarely seen today. These are useful in many circumstances, e.g.: some guy shoots you a snook in church; an idiot is trying to argle-bargle your girlfriend; that guy with the chainsaw doesn't know when to stop; a couple of weasels are bothering your chickens; or even when some hockey puck needs his firkin realigned. I guess that's enough for now, those are just off the top of my head, I'm sure there are plenty more times when this would come in handy.

Robot Hunter

THE ONLY TRUE

es parte de un sistema maya conocido como

"maquina para puñetas"

asi es, en esos tiempos cualquier pendejo se podia divertir con ella

segun antiguas inscripciones el rey Huixtlillopoxtli jugaba con su hijo todos los dias con una de estas

It molds the shoe size into the rubber heel of a boot. The sizes are in US/Canadian and Japanese I believe.

Like some have already guessed, it stamps numbers, but more specifically, it stamps the 12 months of 1956 and then Jan-Mar of 1957.

Really painful cock ring.

Hi,
Happy as I was when I won the shirt, I never actually got it :(
Is there any chance of claiming this prize?

Sincerely,

Marcin Petruszka