Mogens Koch Prototype folding Safari Chair 1930's  

I would like to see the NYC reference you cite.  I find nothing online to support the claim that this is a Mogens Koch design -- despite its functional similarity to his production chair.
http://www.scandinavia-design.fr/folding-chair-carl-hansen-son_en.html
http://www.designboom.com/eng/education/folding/director.html
Would an early functionalist designer have produced, for a church interior or as a prototype, a chair with brass-knob decoration ?

Since you are focused on value, I would guess It would hurt the value or at best not help it. It is old enough that the finish condition is forgivable. You probably should get the missing rings fabricated though.

Something something Swedish classicism, Finland Station its in Frampton somewhere, the boring bit.
Early Aalto and Mies can be surprising so its a possibility imo.
Nordic classicism wiki p , my dumkopf phone wont paste

Thanks for the replies. I wasn't able to find anything with these chairs and the spheres that are online. The only thing that has the spheres I can find with my research is the one a gallery has in NYC. If anyone has any other places they recommend looking, please let me know!
Thank you,
Scott
Heath: I wasn't able to clearly understand your post.

To be clear, the gallery in New York has this chair as a Mogens Koch design ? Any further reference would be helpful.  Thanks.

Here's the link. Thank you!

Well, your question about how many of these "prototypes" was made seems apropos...
It could well be plenty of things, but seeing as Rud. Rasmussen is still in business, I want to see them authenticate the chair. 

Yes that is what I was thinking. They have been closed for the holidays until the 5th. Thanks!

That would be becuase I was drunk when I typed it.
Was just pointing out that a lot of modern designers worked in overlapping periods, the blip of a minor revival and the modernism we know now. Your chair seemed a good example.

Thank you for clarifying! 

A small machine shop that specializes in prototype work could easily replicate the missing flared brass collars and application of the right patination chemicals can tone them to closely match. It's probably best to consult an auction house as to whether that might enhance any return. Beyond a light-handed and judicious cleaning, though, I wouldn't touch the existing overall surfaces. But, again, if resale profit is the motive, a good dealer or auctioneer is likely your best bet for advice.

Yes, thank you. I agree! It's been tough around the holidays, but I found a place that will replicate the brass rings. I found a place that will professional refinish the chair, but I'm going to hold off for now. 
I appreciate everyones input!

Onece again tktoo provides sensible and informed advice.
I have a request in to an old hand on things Scandinavian;  hope too hear more about this interesting piece.  

SDR - were you able to find anything out from your friend? I've emailed Rassmussen but unable to get a response. 
Thanks!