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Hello Steve,The first 185,000 clocks that Lenzkirch made did not have a trade mark on them.
"Someone" needs to do the same thing I am doing for Gustav Becker clocks. Start collecting data in a spreadsheet, beginning with serial number and then adding data fields that will help identify models, descriptions, related patents, trade advertisements, technical and commercial references, etc. After you get about 2-300 clocks in the database in sequence by serial number, you will be amazed at the patterns that begin to form from which you can make informed judgements about the dating of these clocks. Takes time, patience, and a singleminded approach to record every single clock you come across.Maybe, one of these days, we something better to go on than dividing 1,000,000 by 43 years!