I never managed to find the missing parts or a suitable case, so I sold it on Ebay. Craig is a watchmaker and managed to find the missing parts and a nice vintage case of the correct period.
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For the original post about the movement see: http://classicheuers.blogspot.com/2008/09/gold-dialed-valjoux-23.html
Thanks Craig for giving this rare early Heuer movement a new life. See www.chronodeco.com to see more of Craigs work on rare vintage watches.