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HEUER MASTER-TIME (24H) with case #23552 *PIC*

This piece I have from a seller has the slim chromed case (13mm) and the Arogno Cal. 28H movement. Is this an original case for that modell? I'm aware that the 12H model can have both, the slim and higher (15mm) case, obviously dependig upon the production period. When did the change from 13mm to 15mm happened? Thanks for answers.
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