jalk or juhl?  

Quality chair, I say it's Gre...
Quality chair, I say it's Grete Jalk.

me too, out of the choice...
me too, out of the choice of those two, I'm going for Jalk. But it could be someone else?

would grete use exposed...
would grete use exposed screws?

although
the arms do look similar to finn juhl, the way they connect and the thickness near the back.
just a thought.

Also....
for your table, I say forget all the danish made tables, go straight for an oval wood top Saarinen tulip table, the blue would compliment the white base, and the wood tones of the top and chairs would work nice with each other.
Do something different, with your different set of chairs.
Combining the too styles, would be a great different look.
(:

Neither
Glostrup made many oftheir own designs, generic if you will.
Just because it is danish it does not mean that is has some important designer attached to it.

This site attributes the...
This site attributes the chair to Jalk, perhaps you could email them and ask for more information.
http://www.mastergart.de/archiv/archiv.html