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Audemars Piguet

all 5402 steel models...

 

had a individual engraving like A - 1550, B - 1033 ... or something like this.

Service caseback don´t existe, because the 5402 has a monocoque case, so that it is only possible to change the whole case.

For me the case, that you show on the picture is original, but polished - look at the deepness of the "Royal Oak" on the pictures and compare them.

 
Perhabs there was once a individual engraving from the owner, that has been removed - and the inividual number with ist?  Who knows.

The 99xxx you wrote about, is the number the official AP casebacknumber (you find this on official letters, certificates from AP to your watch and you find it in parts - not complete-  inside the watch engraved on case) begins with for one special watch (in your case the number for the watch you show us, if the number is correct for this watch).

AP has used different "logical systems" for the 5402 during the series A, B, C and D  and sometimes it is possible to find out the individual caseback-number, that is engraved on the caseback with help of this number (67XXX, 80XXX, 99XXX, B28XXX, B29XXX) - but it is not possible for all watches - i am sure not for D-series. For A-series it is easy.

99XXX i have not enough information - but it could be a B - XXX       - but i am really not sure.

 

regards

 

Stephan

 



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10 Comments view entire thread 

Serial No. on 5402.. and caseback..

 
By: hans_jorgen_1968 : November 5th, 2011-12:59
Hi guys Has all 5402 a letter and number on the case back? If not, is it a service caseback or not genuine? I ask, as this is a caseback of a 5402 sold in 1975, with AP above 6, with stated individual serial number from AD: 99xxx.... Best, and Thankyou fo...  

all 5402 steel models...

 
By: only5402 : November 6th, 2011-01:16
had a individual engraving like A - 1550, B - 1033 ... or something like this. Service caseback don´t existe, because the 5402 has a monocoque case, so that it is only possible to change the whole case. For me the case, that you show on the picture is ori...  

and

 
By: only5402 : November 6th, 2011-01:28
i answered a little bit untrue (only a little bit), because also for D it is possible - but not only by comparing the "official caseback-number" for a D-series with another number from D-series, from wich you know both numbers. Than you can find out by ma... 

this is as a generell advise totally correct,

 
By: only5402 : November 6th, 2011-01:45
if all other aspects of the watch are correct, you also can by a watch like this. But the price must be really low according to a 5402 with correct case-back and if you want to sell this watch one day, all potential byers (and real collectors don´t are po... 

Dr. T :-) we really need your help on this one....

 
By: SALMANPK : November 6th, 2011-02:23
this post reminded me of Dr. T's posts: ap.watchprosite.com and this one: ap.watchprosite.com = Is it also possible that the reliable sources and old timers (as in old AP employees) that for many years said that the 5402 was 1st released without any leadi... 

He means no disrespect...

 
By: Ancienne Le Brassus : November 7th, 2011-12:08
Hi, It's that there are no APRO's without the A designation for the serial number. There simply is no AP RO number 001, but there IS a A01- and that wold definitely be the first one sold. If you have the new AP book by F. Chaille (Flammarion pub), you'll ... 

5402 st serial number

 
By: 1175trek : March 5th, 2023-00:44
I recently found a similar serial number. It's 99XXX. Please let me know if you have any new information regarding this serial number. By the way, this watch has a certificate of authenticity issued by Swiss AP. What that means is that this serial number ...