Tugendhat Chair Production Variations  

There seem to have been been several changes to the Tugenhadt chair throughout its production. Gratz Industries is currently producing the chairs & offers them in three variations.

I find it interesting that the dimensions for the chair that Gratz Industries give on their website vary from the dimensions that Knoll lists on the website. It is my understanding that during the chairs production run Knoll contracted Gratz Industries to manufacture what was known as the MR70 chair.

Gratz Industries list the chairs dimensions as 30W X 24 D X 33 H & Knoll lists the chairs dimensions as 29 ¾.W X 27 ¼ D X H 32 ¾.

I have seen what were listed as early versions of the chair on auction sites with adjust straps with a buckle on the upper portion of the frame. I've seen other versions where both the upper & lower straps are secured to the frame with what appear to be rivets.

I had the opportunity to see a pair of chairs here in West Hollywood @ boutique. These chairs had Teledyne labels with serial numbers affixed to the lower portion of the frame.

Both the upper & lower straps on these chairs had been secured to the frame without using any metal fasteners.

Is there any documentation of the original chairs manufactured for the Tugendhat Villa by Josef Mueller Berliner Metallgewerbe? How do they original chairs vary from the chairs Knoll marketed as the MR70 which were produced by Treitel-Gratz or limited production chairs produced by Gerald R. Griffith at the request of Mies Van Der Rohe?