Hi Ben,
as far as I know the 9000 is generally the reference number of all Conquests housing the Caliber 19AS (19ASD = "Calendar"/date = 9005).
9000-1 to 9000-20 (not sure if there are 9000-21 or higher) points on the iteration (as you wrote). Also important the individual case number (143 on my watch, punched on the backside of the eleven o´clock lug and on the inner caseback.
rgds - h.u.
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