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Message: <blockquote data-quote="elkcub" data-source="post: 1481305" data-attributes="member: 14473">It seems that the first digit falls in the set {0, 5, 3}, where:0 = 10x5 = 8x3 = 12xThe second digit falls within the set {0,5}, independent of the first digit.  What could this mean?  (What happened to 1, 2, 3, and 4?)  The last four digits are clearly sequential within the range {1, 2, .... 9999}.Unless more variation is found with the second digit, therefore, there would appear to be a max of 20,000 produced for each magnification.  My guess is that the second digit represents separate manufacturing runs of up to 10,000 units each.  The two runs might or might not differ in some way, such as coatings.Okay, shoot me down.  :eat:-ed</blockquote>