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Not clear what you are asking. That model looks like a folding version
made in the 80's? Not the higher quality 'fixed' frame that circa50 sells.
I have a couple folding ones i have had for 20yrs. They can be had for 50-60
brand new...
Those covers will need replacing at 25-30 bucks each.
http://www.wolfriverhammock.com/store-categories-Butterfly-Chairs_197995...
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Brief history...
"The BKF chair is a modern update to a design known as the Tripolina chair, a portable chair introduced in the early 20th century. Jorge Ferrari Hardoy along with Antonio Bonet and Juan Kurchan developed the BKF in 1938 for an apartment building they designed in Buenos Aires. On July 24, 1940, the chair was shown at the 3rd Salon de Artistas Decoradores exhibition where it was discovered by the Museum of Modern Art. At the request of MoMA design director Edgar Kaufmann Jr., Hardoy sent 3 pre-production chairs to New York. One is in the MoMA collection and one is at the Frank Lloyd Wright house Fallingwater, but no one knows where the third chair went. Naming the BKF as one of the "best efforts of modern chair design," Kaufmann accurately predicted that it would become extremely popular here. Likewise, Hans Knoll recognized its commercial potential and added it to the Knoll line in 1947."
http://en.wikipedia.org/wiki/Butterfly_chair
Butterfly
I'm glad to hear the originals are comfortable. I have a folding one like the ones in Tom's pic, and I find it so uncomfortable. I want to like it, but it's all form over function. Look at Tom's pic. The chair is angled so that you have to lean back, but your head has no support at all. I'm 6'.1", though, so probably it would be comfortable (and fun) for kids or smaller adults.
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