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Author Message   Msiegel Tinkerer Username: Msiegel Post Number: 173 Registered: 03-2008 Rating: N/A Votes: 0 Posted on Monday, February 08, 2010 - 02:47 am:    Tom's right, it was manufactured by Ernst & Wilhelm Bertram of Munich. One of the first makers of lightmeters in Germany (est. in 1929). Maybe better known is their "Electro Bewi" (later Bertram Standard). The Chrolon cost a little bit over 50 German Marks in it's time which was about 20% cheaper than the Gossen Sixtomat 3x of that time. You can also find some info about similar Betram meters here: http://www.jollinger.com/photo/meters/meters/bertram_chronos.html