I have recently aquired a s/h Profisix and am very pleased with it. It did not come with a user manual but that was not a problem as it is very easy to use. A couple of days ago I stumbled on a link to the manual on the Gossen site and downloaded it. To my surprise it describes a zone system scale in the lower dial area. That is missing from mine. I did a quick check on ebay to see if that was usual, but all specimins I have seen have the scale. It doesn't really matter; but I was curious as to why? Early model? Does anyone have an idea? Serial number is 0878856. Thx, Mike