2 Eames leg splints, both quite different. Where is the other one from?  

Interesting
I've never seen one like that either.

Artek pascoe?
Maybe it's one of these?...
http://www.schneidercolao.com/index.php?/alink--text-decoration-none-col...

Wow
That sounds like a great story, if true.

I think we may have a winner
mvalen, I found these other images
http://modernlove20.com/images/artek-eames-2.jpghttp://modernlove20.com/images/artek-eames-3.jpghttp://modernlove20.com/images/artek-eames-4.jpghttp://modernlove20.com/images/artek-eames-5.jpghttp://modernlove20.com/images/artek-eames-6.jpghttp://modernlove20.com/images/artek-eames-7.jpghttp://modernlove20.com/images/artek-eames-8.jpghttp://modernlove20.com/images/artek-eames-9.jp g" target="_blank">http://modernlove20.com/images/artek-eames-2.jpghttp://modernlove20.com/images/artek-eames-3.jpghttp://modernlove20.com/images/artek-eames-4.jpghttp://modernlove20.com/images/artek-eames-5.jpghttp://modernlove20.com/images/artek-eames-6.jpghttp://modernlove20.com/images/artek-eames-7.jpghttp://modernlove20.com/images/artek-eames-8.jpghttp://modernlove20.com/images/artek-eames-9.jp g"/>
http://modernlove20.com/2010artekeames2.htm
http://modernlove20.com/2010artekeames2.htm

Leg splint history
After the disaster at Pearl Harbor the US military very quickly enacted new rules governing wartime production which said in short that there would be no single point of manufacture and/or supply for any military equipment.
The Eames designed leg splints were not an exception to this rule and were manufactured on the east coast by Artek-Pascoe a concern already familiar with working with molding wood due to their production of Alvar Aaltos bentwood furniture.
According to an interview in Living for Young Homemakers Charles Eames consulted with Artek-Pascoe on the manufacture of the east coast splints and it seems likely that he traveled to New york to assist with their tooling up for production.

straylight
Thanks for the info!

Attributions eh?
Its totally normal for military use materiel to be made at different locations to ensure consistency of supply etc and I'm sure that this is the case here. Thanks to mvalen for posting the link to the dealer selling these...some dealers eh? Not satisfied that these splints were designed by Eames this one has decided that because they have some Artek-Pascoe brown paper round them they must have been designed by Aalto as well! God loves a tryer as they say. As we are coming up to Awards Season - Dumb Attribution of the Year?

In fairness,
the dealer schneidercolao wrote "produced by Alvar Aalto and his Artek Pascoe company", not "designed by". This is correct, and no "attribution" was given.

Thanks for all of the info
Just wanted to say thanks to everyone for the info!

This is the text
"Eames / Aalto Leg Splint Collection
Extremely rare collection of 5 leg splints produced by Alvar Aalto and his Artek Pascoe company.
It is speculated that Aalto fabricated these samples to win production rights which were later awarded to Evans. One splint still wrapped with the ARTEK PASCOE stamp. c. 1942"
I think it is giving this seller an awful lot of credit to say he isn't making an Aalto attribution here - or am I just a cynic?

Cynical
I think you're being far too cynical in exactly the wrong direction.
The seller states: "It is speculated that Aalto fabricated these samples to win production rights which were later awarded to Evans. One splint still wrapped with the ARTEK PASCOE stamp. c. 1942"
The implication here is that Aalto fabricated these himself, with his own hands. They never once suggest that he designed them...
Now granted that this rather fanciful speculation is just that, and nothing more, had they done even rudimentary research into the matter they would have found the NY Times article which specifically states that Artek-Pascoe manufactured leg splints during WWII which would have readily obviated any speculation into the matter.