What do to with this Danish Ostervig Teak Table?  

if it is teak and no clear coat...
you should be able to steam the scratch out with a wet cloth and cloths iron....but that scratch seems very small like it would almost disappear with a little orange/teak oil

If you wet the area does the...
If you wet the area does the 'scratch' get darker? If so, you will have to sand the area to make it level if you want a perfect finish. If not, you're fine and follow the directions below. Either way, that looks to be such a minor imperfection I would definitely leave it as it. It's going to get scratched again anyways if you plan on using it.
At first glance, it doesn't look like in needs to be refinished at all. More simply, get some 100% tung oil, boiled linseed oil, or even beeswax furniture polish and it should definitely hide the 'scratch'.

A few more photos. . .
including some slight marks/dings on the legs, and a small nick on the top of one of the moveable legs. Not sure what to do about those.

leave it alone
That is a fantastic table in what appears to very nearly excellent condition. Aside from applying a small amount of Danish oil to the scratch on the table and the leg, I would not touch it. It's only original once, and once you start to mess with it, it will never be the same.
Just my two cents, but if it were mine I'd take three minutes to oil it, let it dry, and then have a dinner party.

I side
with the don't mess with it crowd. A small amount of oil and then obsessively wiping it off should work for the scratch. I absolutely would not go over the whole thing.

One quick wipe with teak oil...
One quick wipe with teak oil (and immediately wipe off) and that scratch will disappear. The scratch might be a little darker for a day or two, until the teak oil fully dries, but it will blend very well long-term.
The only scenario where you wouldn't want to do that is if someone had applied some sort of clear coat to the table after it was purchased, which doesn't appear to be the case from the pictures.