Cad drawing for a eames aluminum chair
Labels and stamps are the best source of authenticity as reproduction makers do not copy with the intent of 'passing off'. It gets a little more difficult through the 80's and 90's where sticker labels were used but then easier into the 2000's when fabric labels were introduced. The early pieces were all stamped with patent pending/patent number/model number directly into the casting of the alu frame. All Alu Group chairs have a label or stamp.
The good news is however that it is very easy to determine authenticity thanks to a number of checks you can perform.
#Cad drawing for a eames aluminum chair code
Initially released as models 681 (no arms) and 682 (with arms) the aluminum group lounge chair has seen a degree of changes (and indeed code numbers) over the years. Part of the 'Aluminum Group' and released in 1958, the Eames Aluminum Lounge Chair was arguably the first to be made in the material and was originally designed to function as both an indoor and outdoor chair.