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The before or after numbers I believe is some sort of Rolex inventory control. The only numbers that mean anything is 24-6020 tube 24-600-0 crown the 0 for crown is for stainless if it ended in an eight it would be 18k gold in a 9 it would be white gold. the 24 is referencing crowns and tubes 25 is for all crystals 29 is for all gaskets.Part numbers go by calibre and then the part number say like 3135-568 would be for an axle and so on. Hope that helps Rik
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