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like in this Milspec 1 ???

 








not certainly " Air Ministry " as this  < AM > is an engraving made at the Blancpain factory .
this abbreviation appears only on some Milspec1 and not on other FF ( AFAIK ) and neither on TR 900.
the 3 digits figure is in my opinion the case number .
honestly I have no clear ideas about the " AM " meaning .....

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