1964 advert; chair identity  

@lexi, I got maybe a bit closer by substituting "chaise" for "lounge chair" as search terms but ended up frying my retinae just the same.

Really, if you can't ID this one, it's almost unfair to ask mere mortals for help! 🤓

@tktoo2. Nice description of your search efforts. Know how you feel. Thanks anyway for trying.

Since the Google image search function became the "go to" option I have lost a well honed skill,  developed over the years, of using a  word search and gradually narrowing the search to a few "key" words, which worked a lot of the time.!!

😏

@tktoo2. more googling and retina "burning ". Found a chair designed by Katavolos, Littell & Kelley on a Vitra poster!!

Closest to frame shape/design I came across. From 1952.

Guess someone was "inspired" and designed the red chair above.

@lexi, 1952? Wow, that's even older than I am! Much earlier than I would've guessed. '64 seemed early for the red chair to me, too. Both look so futuristic even now.

I too put in some retina-burning time looking for this one before giving up .  I also saw the "T-chairs" by Katavolos, et al and thought it could lead somewhere, but it didn't, at least as it pertains to the red lounge.  I did learn that they were, and still are, made by Gratz Industries of Pennsyvania.  They have a nice website with interesting info on their history, such as their  early production of some Mies van der Rohe and le Corbusier designs for Knoll.    

I also thought maybe the other furniture in the ad could be a clue.  The black chair looks like a "Bachelor" chair by Verner Panton for Fritz Hansen.  And the lower half of that ad features a Jacobsen "Egg" chair.  So I was thinking odds were decent the red lounge lounge might be by FH too, but I  haven't found anything. Maybe someone has access to a 1963/64 catalog or book that covers that time period.      

@mark737. I also went down the Fritz Hansen route. Got nowhere.

I found another Royal System advert which has a Ross Littell chair for ICF (Italy) but that line of search did not get me anywhere either.