Also thorough my research I discovered that "L" refers to natural finish - were there other letter suffixes that note different finishes.
It sounds like there is little information to be gleaned from the serial numbers. Were these just randomly assigned?
Many of these acoustics I've seen online appear to be tested by someone named Müller. Was he (or she) the main tester for a certain period. Mine appears to be tested by someone else. And what about these model numbers 06011, 06111, etc. that are stamped on some but not all labels.
I also discovered that "EX" refers to those guitars that were shipped to export markets. Are there any other codes or details that offer useful information about these guitars.
Thanks to all the experts who make your knowledge available.
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