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I took some time seeking online to find out which authentic-looking Longines Ref. 4974 are listed. And which order/batch numbers these watches have. One 21699, three 21514, two 22026m, one 22127 and two 22184. Screenshots attached.
So reference 4974 was sold with these order/batch numbers, at least. I couldn't see any logic in that. For example, radium configuration or not. Maybe that the serial numbers are closer together in each case.