Florence Knoll Sofa details... ?  

No buttons is correct
No buttons is correct

Correct
This image is from Knoll's website, so perhaps they thought a response was not necessary, or that you would eventually see it on the site.

Florence Knoll Sofa details... ?
Thanks so much jesgord and the_beloved. For the life of me, I couldn't see whether there were buttons or not on some of the photos. I wonder when they added the buttons?
Any idea of the cushions? With the three-seater, it seems to make sense that the seat cushions would not be attached.

is this thing actually comfy?
is this thing actually comfy?

"is this thing actually comfy...
"is this thing actually comfy?"
Remarkably so.

I too have this sofa and
everything looks as it should. Additionally, this sofa is extremely comfortable.

Speaking of Florence Knoll...
Speaking of Florence Knoll sofas -- I have one, an early 60s settee, and it is missing one of the bolts that goes into the chrome side rails and holds the sofa body to the rails. I wrote to Knoll asking about a replacement bolt, but it's been a couple of months and haven't received a response. By any chance, would anyone on here know how I could find one of these bolts?
Thanks

steelcase also....
Steelcase also did a version of this sofa. Same type of bottonless tufting.

This is true
and from my previous research the difference is contained within the porportion of the frame as well as the "density of the legs." That is, the legs on the Knoll couch should be solid and not hollow which is the case with Steelcase couches. However, from earlier reports the latter still performs well.
There have been many forums in regards to this matter and I am always taken back by the variety of manufacturer's who have copied this sofa.
Just curious when there is a tag that reads Knoll Art Metal vs just Knoll what year is the production?

Knoll Art Metal
Florence Knoll sold the company to Art Metal in 1959. Art Metal was eventually purchased by a financial firm called Heller in 1967, and in 1969 Knoll Associates became Knoll International; I'm pretty sure that no Knoll furniture was labeled "Art Metal" after that.
So... 1959-60 to 1967-69.

Thank you
for the history. Blessings

Knoll Arm Chair?
Did steelcase make a version of the Knoll Arm Chair with tufted seat cushions? Everything seemed right with this pair that I went to inspect with exception to the arm length, it just felt slimmer than my Knoll couch. Here are some details: There are no Knoll tags only a serial numbered tag from a bank, the back cushion is attached to the frame while the bottom cusion is removable, the legs are solid, etc... Does anyone have any photgraphs of the underside so that I can compare? Thank you in advance...