a signed crown is also "original" - and specially in AP´s eyes, because if AP (or a authorizised
dealer/watchmaker makes a revision at any time they change the crown at this modell.
The reason is, that in the crown there is the blanket (or what it is called in english - i
don´t know really at that moment) - to make it waterproof) integrated.
From one moment on (i don´t know wich year it was), AP only uses the crowns with
AP-Logo, because the unsigned crowns had been finished.
I assume that your watch in the 35 years before the revision sometimes was checked
(or perhabs revisioned) and for waterproot reason the crown was changed at a time the unsignet crowns
had been finished.
So - don´t think about this little (very little !) detail. It is not really importaht and in 2010
AP - it is shure, that they made this - in any cse they put a new crown on it (otherwise
they give you no guarantee).
There are some "crazy" (in a positiv meaning) people, who change the crown back or
order AP or a watchmaker definatly to do this, because it is there own wish.
Have fun with your 5402 !
regards
stephan