I have seen this on several brands of frames. Today I had one marked in the bridge 41 21 4-1 . Now I know what the 41-21 is but I don't know what the 4-1 one is, can't find anyone in the business (including the importers and suppliers and reps of the frame companies) who has a clue what the second set of numerals is.
It drives me crazy when I don't know something (which is why so many find me strange) especially something I should know in my industry. The CE designation bothered me for years until I finally found out what that was.
Chip
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