Sweet little score today!  

Your knob.
Any competent wood turner should be able to easily replicate one for not very much. The metal threaded insert may or may not be necessary depending on expected use.
Hard to tell wood species frome one picture, but I think you're probably close.
Case joinery is either "box" or "finger" joint, or dovetailed. Again, can't tell from just the one image. Either way, it's machine-cut, but that doesn't necessarily indicate either custom or production.

Sweet little score.....cont.
Thanks Tktoo for your input. I have been unable to add an additional image of the original message so I just added it here (hopefully)
Does anyone in this fab community know who the maker is of this little gem?
Also, it has several stains on top so I don't know whether to sand and re-oil or just live with it.
thanks again for your help!

Well, Terry, the case sure looks like solid wood,
so there's no worry about sanding through paper-thin veneers if you can't treat the stains successfully by other means.
It is a nice table. Lucky you!

Now that's a
solid-wood carcase !
I'm a bit surprised the maker didn't think it necessary to make the upper drawers from a single board, so the grain would be continuous.
On the other hand, those who make from solid material have their own aesthetic -- sometimes they even celebrate anomalies and "defects" in the material. One rational explanation is that no two (or, let's say, three) boards can match each other in grain appearance, anyway -- and another is that there is often a limit on the size of acceptable pieces of wood, and the desire to make use of as much of these desirable materials as possible.

Hvidt and molgaard
The finger joints on the corners and the solid teak case are very much the style of Peter Hvidt and Orla Molgaard-Nielsen. But those drawer pulls are not highly characteristic of their work. Still searching their work might turn something up.
Congratulations, solid teak danish case pieces are quite rare.

Nils jonsson for troeds
Another extremely similar (in the details) sideboard is identified as nils jonsson for troeds. I would bet this id can be confirmed by someone else here or by scouing the Internet for another exemplar with the troeds brand in photos.
http://www.bukowskismarket.com/items/307798-sideboard-nils-jonsson-troed...

"I'm a bit surprised the...
"I'm a bit surprised the maker didn't think it necessary to make the upper drawers from a single board, so the grain would be continuous."
Perhaps the upper drawers are not in their correct slots? I had the same initial thought when I had acquired a Vinde Mobelfabrik dresser with what I thought were poorly-matched drawer grains. However, once I started playing musical chairs, the pattern harmoniously fell into place.
Oh, and I always vote for a first step of reconditioning the wood, versus refinishing or sanding. You'll be amazed how much improvement can be made to the appearance without losing the existing patina. Sanding can always be done as a last resort if significant damage is present.

Continious Grain Pattern..... missing
I agree with you...that is one of the first things that surprised me with the non matching grain pattern on the top drawers. I was not sure if this was a detraction and was surprised that it did not continue.
However I liked the explanation that some cabinet makers chose to "do their own thing" and not continue the flow for whatever reason.
I will start with the two other designers that have been suggested here and hope that we can figure out who the maker/designer was.
It's so nice to be able to come here and have all of your expertise! Also, I didn't realize that Danish solid wood pieces were unusual.
Thanks again for those of you who took the time to help me with this!

Grain patterns do match!
After I wrote the earlier comment, I had a brain fa@t... went out in the garage and started flipping the drawers around and they do match! Duh? Now that I have had my coffee this morning my old brain is starting to function.
(Ha Ha) I took the two outside drawers and flipped them and Voila!
thanks again SDR

Using Photoshop, I swapped...
Using Photoshop, I swapped the left and right drawers and it looks like it could be the case that the grain patterns match, like cdsilva was suggesting. Do they still not match if you swap the drawers around?

I should have read your comment more thouroughly!
Thanks so much for your input..earlier I just skimmed your message and didn't catch the part about your experience with moving the drawers around. (Lack of coffee)
Just got it late yesterday so I only had time to clean it
first. When you mentioned just refreshing the finish vs. refinishing what did you mean? It has some dings and dark spots on top, but I think it adds character, however I would not rule out trying to improve the top's condition somewhat. Also, I have noticed that the joints at where the the stretcher meets the legs has separated slightly. How do I go about closing those?
thanks again cdsilva!

Thanks for your expertise leif erickson!
I will work on this today and see if I can establish who indeed made this little sweetie!

Solid case pieces
Solid teak case pieces, which is to say sideboards, dressers, cabinets, et al are rare. Solid teak tables are also rare. It was just so much less expensive to cover plywood or chipboard with veneer.
A corollary to this is that the box/finger joints you see on the edge of this piece are a rarity because that joinery does not make sense construction-wise or aesthetically if it would expose plywood or chipboard.
Also, if this piece is troeds, and I think it is, it is Swedish. And that makes it all the more surprising that it is solid as the swedes were late arrivals to the danish modern party and were then competing against mass produced, cheaper pieces, which meant the wasn't much market for the expense of a solid wood case piece.

Photos of the Dark spots
Not being able to see the top of the piece very well in the photos it is hard to suggest a course of remediation for the top. Can take some photos?