Arne Jacobsen swivel office/desk chair  

Ronaldo,
For an increased chance of answering your questions please also include photos of the base.

Here's a picture of the base. Hope it helps.

Ronaldo,
Your chair was manufactured by Fritz Hansen as the tag indicates. The additional holes on the base are used for attachment of the arm antler.
I am curious why you would question the authenticity of this obvious original Arne Jacobsen Series 7 chair with swivel base.

Dear niceguy,
Thanks for the info.
I wasn't in possession of the picture when I asked the question. I have to admit it reassured me when I got it. But then again a tag is just a tag and there's a lot of replica's around so it never hurts to be informed. It was the combination of four legs (earlier) and black plastic wheels (later) that made us hesitate.
I'm a layman and what is obvious to you is a bit of a mistery to me.
Since you seem well informed : any idea on a year/era of construction?
Ronaldo.

This seems like a good time to throw some hate at people who would manufacture, sell or use counterfeit (or "real") labels such as this for profit...

Yeah, paper labels aren't any guarantee of anything, unfortunately!
The black plastic castors might be later replacements. Rubber wheels eventually wear out, especially if used on certain flooring. I've seen some that were a mess! Those black plastic ones look like they could be the early patented Danish design that has been widely copied to the point of looking cheap these days, but the lighting isn't good enough to see for sure.

Ìt's quite possible that the wheels are replacements. We've been looking into it and the chairs with four legs all have the iron look castors. So we think they are either replacements or the chair was made in a period between the four and five legs era. Or maybe it's a chair assembled from different pieces. Like maybe the base and the seat.

Ronaldo,
Initially you desired authentication of the Fritz Hansen Series 7 chair. Your wish was granted.
Now you wish to know every detail of the chair. Tedious questions are best referred to manufacturer.
Yes the castors have been replaced and your arm antler may be missing. Move along...

Well for sure you do not do justice to your name "Niceguy".
This is a forum and if you do not like my questions, I suggest you "move along"...
There is no need to be harsh, you can go on to the next post and ignore if it doesn't suit you.
Thanks anyhow for your answers even though you take the mere presence of a sticker as sufficient proof of authenticity.

Ronaldo,
You are as naive as your continuous questions and your ridiculousness reasoning. My photo indicates how I know Series 7 chair is authentic. I do not require a label for verification.

I would back down a bit if i were you Niceguy and maybe even appolgy to the guy.
I believe his questions and concerns are legit since i have never seen that combination of wheels, base and seat attachment in one single chair of any era of the 3117 chair.
I have owned many of these chairs and all the four legged ones have had either metal wheels or grey plastic wheels of a similar design to the metal ones.
Also the seat attachment with that large plate is a later feature that i have only seen on the five legged version.
Another thing is the gas height adjustment, all four legs bases i have seen have had the simpler lever.
It is possible that this a transitional chair though, most likely from the late 70´s or early 80´s.
On the FH sticker there should be a date code of 4 numbers, could you check that Ronaldo?

Panton Home,
I too have and do " own many of these chairs". The chair in question is an amalgam of several Series 7 chairs added together to make one complete chair (not a "transitional chair"). This mystery is easily proved by contacting Fritz Hansen rather than inane second guessing. Anyone with so many trivial concerns buying an used chair should do themselves a favor and purchase a new chair from an authorized dealer.
Ronaldo I am sorry to have called you naive. An ignorant amateur is more fitting.

So how are you feeling today? Tell me about your mother...
http://agableone.tumblr.com/image/94037349729

Ronaldo, please stick around. This board has a lot of people who are happy to offer help when possible.
There are several reasons why it's good to ask these questions here instead of emailing the manufacturer for information.
1. Other people are interested in learning new things. I have never owned this particular chair and it's not something I'd buy for myself but I would buy one to resell. If I ever come across one in my frequent visits to thrift stores, I might need to verify its authenticity immediately without waiting hours or days to hear back from Fritz Hansen. I know I'll remember that it was discussed here and I'll be able to look up the discussion quickly, and hopefully I'll figure out whether it's real or not. Pretty sure plenty of others use the forum in this way on occasion.
2. It demonstrates to new collectors---and reinforces the lesson to experienced collectors---the importance of checking every single detail of an object before investing in it. More people than ever before know that MCM is highly sought after, and that means that the number of fakes and altered pieces has increased as manufacturers and dealers try to make a buck. Discussion on how to tell the difference is never, ever a bad thing. Knowledge is power.
3. It's interesting. Period. (Plus, if it brings people like My Panton Home out of lurking mode--even more interesting!)
I don't like to speak for others, but I'm pretty sure the above reasons are all on the forum owners' agenda for this place. So thanks for bringing this up, Ronaldo, and please feel free to ask any further questions and do post any new info you get!