Is this gateleg table really by Kurt Østervig?  

Wright has sold that table as an Østervig. Deconet also has it as an Østervig. I would probably consider him a ship builder rather than an Architect. 
Please post a link to your blog when you are finished.

Apparently not Ostervig:
http://www.paeredansk.com/n-kofoed-1964-vintage-dining-table-product-page

As LKH said. Not Østervig. I suspect the attribution came about because there is a coffee table with similar legs. 
Niels Koefoed design from 1964, model #304:
http://koefoed.dk/eva.htm
i think I saw photos of a marked one once. Never have understood why Niels Koefoed was fairly reliable about marking his chairs, but not this table. Not that I doubt the design credit, just an oddity that makes me want to know why.

Ah, fantastic! Thank you all so much. But who produced it then? Did Kofoed simply produce the table at his own workshop bearing his name or?

Koefoed produced it himself I believe.  I've never seen any indications he designed other than for his own company.

Thank you, Leif.
I'll add a link to this thread once the blog post is finished.

Or perhaps it was made by Dyrlund. 
Link

Ahr, confused again. So even if both Dyrlund and since Kofod have produced the table, the designer behind it still lingers...