International Designers Group  

Here are some pics.
Maybe these will help.

Nice chair, profile pic? A quick google says an extant Swedish IT/media group existed in 1978 by that name, similar font, same initials. Another chair on 1st dibs, seller says it was made for a compnay called Bra Bohag, some Swedish Scottish links, again a company by that name still exists and seems to sell a lot of vintage Swedish things, contact them? http://www.brabohag.com/?tag=swedish

The hunt continues
Thanks, Heath. I contacted Bra Bohag, a Scottish company that does business with Sweden. They had never heard of IDG. But they did give me the contact info of a Swedish magazine called "Retro" that they said might help me. I emailed them and got a response in Swedish, but if you press a button you get an automatic English translation. Cool. They're going to look into it. In the meantime, does anyone out there know anything about IDG?

The IDG mystery continues
I received an email back from Viveca Carlsson at "Hus & Hem Retro" in Sweden. She writes:
I have never heard of the IDG. Maybe it was a group of Swedish furniture manufacturers that labelled their products this way for the export market, but that is just a guess. I looked through a list of Swedish furniture manufacturers, but IDGs name wasn't there.
Very strange...

It's not just Swedish. I have a Wegner ML33 that has the same badge, except s/Sweden/Denmark.

International Designers Group
I have a desk lamp with sticker Made in Sweden for International Designers Group. I believe a knowledgable friend told me there was a store in West Los Angeles...with that name. I'll follow up!

I just discovered
who made the chair I posted above. It's called the "Flamingo Chair" and was designed in 1955 by Thea Leonard for Nassjo Stolefabrik, Sweden. Mine is the only chair I found that had the IDG tag. Madeleine, did you find out anything about the possible West LA store?
BTW, the original upholstery on these chairs was black leather - very classy. It's beyond me why someone would recover it in brocade.

I just found a drop leaf teak table with The same metal tag underneath except it says " made in Norway for international designers group." It's definitely 60s-70s. Any other info about this company would be much appreciated.

I doubt you will discover anything about the table by looking for IDG. I've seen a variety of known designs with the label, so whatever it was was either an exporter, wholesaler, retailer, or something like that. Post some photos of the table in a ID thread.

Found out the table was designed by Bendt Winge for Kleppes Mobelfabrikk (Norway). sold by International Designers Group? It looks like they made a few different models. the one I have is a section of an Interlocking set, as seen here on 1st dibs. http://www.1stdibs.com/furniture/tables/drop-leaf-tables-pembroke-tables... (not for sale) A lengthy post on etsy says this was designed in 1956. Kleppes Mobelfabrikk is still in business. That would date IDG as a retailer to the fifties... possibly?

I also have a piece with the label "Made in Denmark" IDG "International Design Group" I believe it is an elevator table and found a similar one but not exact. Mine has a metal hinge system to lower and raise the table. You can go from a little higher than coffee table to console table height. Would love if anyone had any info here is a photo.

Another IDG chair. 

I have a trio of stoneware canisters made by L. Hjorth, made in Denmark, one has a paper sticker, "made in Denmark, IDG.