Audemars Piguet movement identification please

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I am hoping that someone here can confirm the identity of the movement in my 18k AP ultra thin manual wind.
 
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It's their ultra slim movement, Cal 2003, 1.64mm thick, developed in the mid-40's. Used by Vacheron Constantin and others. Super high qualty and fairly rugged for an ultrathin. I don't think AP uses it at the present time. I have it in an AP perpetual calendar.