Kust Olsen for Glostrup  

If it was made by Glostrup, then you ought to be able to find at least one of these chairs with a Glostrup label. I mean Glostrup did label things. Stickers can and do come off, but not 100% of them.
And the designer's name is Kurt Olsen (with an 'r'). Did he ever design anything else for Glostrup? I think the answer is no. This would predispose me to think that you are right to be cautious about that attribution.

Hi Leif, your feedback is always precious. Thanks for it.

This chair is advertised as by "Kust Olsen for Glostrup" on many sites and auction. I seriously doubt that this is correct. Did anyone saw it in any kind of documentation? Can't find it in my collection. Such a popular model must have been published somewhere... Thanks in advance

Sorry to insist! I was about to contact Glostrup Møbelfabrik to ask them directly but can't find any contact info. Does it still exist?

I have a pair of these chairs. There is a Glostrup sticker on at least one of them. I will photograph it if that is useful.
Obviously, paper proof would be preferable to validate any attribution; so far elusive.
There are several attributions online but perhaps all stem from the same misattribution.
Here is a Wright Auction listing ....is that considered a highly risky source?
https://www.wright20.com/auctions/2016/05/scandinavian-design/140
Someone online also links Nanna Ditzel to these chairs and/or calls them Ditzel style but I could not find anything to back that up.
The Olsen attribution is repeated by auction houses and dealers. I completely understand that this attribution may or may not be validated.
Here is an Olsen attribution with similar arms and legs but different maker.
https://www.1stdibs.com/furniture/seating/sofas/kurt-olsen-danish-modern...
that is all I have found so far.

I would not rely on Wright.
Bruun-Rasmussen would be reliable, though.
I am glad to hear it is indeed Glostrup though. Unfortunately the designer half is probably going to require a Glostrup catalog.

Lauritz sold a few of these chairs without attribution to a designer.
http://www.lauritz.com/da/auktion/glostrup-moebelfabrik-laenestol/i3239736/
http://www.lauritz.com/da/auktion/glostrup-moebelfabrik-hvilestol-i-teak...

It really says something when Lauritz, which is filled with wrong information, will not use the designer credit. (Of course in other cases they did).

@ leif: that's exactly what I thought!

thanks to you both. Would anyone have a Glostrup catalog in which this chair could have been published in? This manufacturer doesn't exist anymore so I can't reach out to them.

Hi, finally remembered to get a picture of the glostrup sticker on these chairs...just thought I would add it for posterity (reference )in the thread ...thanks for the discussion

Hi LCA, thanks for your post, this is great info.On my side, still can't get a proven confirmation that Kurt Olsen is (or isn't) the designer.

well I will look forward to verification either way someday. These were stellar chairs that were well priced without the attribution and they are sold. I will miss them, they were unique, comfortable and well made. They made me smile every time I looked at those wee arms,
interesting discussion,
L