The letters in the Audemars Piguet serial numbers refer to a particular manufacturing series and also help us date Audemars Piguet watches that are newer than 1975.
Below are the series lettering, as originally posted on Rolexforums:
- A Series – 1972 to 1975
- B Series – 1976 to 1979
- C Series – 1980 to 1986
- D Series – 1987 to 1994
- E Series – 1994 to 2000
- F Series – 2001 to 2007
- G Series – 2008 to 2010
- H Series – 2011 To ~2012
- I Series – ~2013 to ~2015
- J Series – ~2016 to …
- 1892: 4341 – 4505
- 1893: 4506 – 5196
- 1894: 5197 – 5436
- 1895: 5437 – 5620
- 1896: 5621 – 5773
- 1897: 5774 – 5990
- 1898: 5991 – 6104
- 1899: 6105 – 6294
- 1900: 6295 – 6724
- 1901: 6725 – 6933
- 1902: 6934 – 7892
- 1903: 7893 – 8717
- 1904: 8718 – 9511
- 1905: 9512 – 10219
- 1906: 10220 – 11575
- 1907: 11576 – 11825
- 1908: 11826 – 12630
- 1909: 12631 – 12851
- 1910: 12852 – 13762
- 1911: 13763 – 14735
- 1912: 14736 – 15589
- 1913: 15590 – 16675
- 1914: 16676 – 16930
- 1915: 16931 – 17725
- 1916: 17726 – 19524
- 1917: 19525 – 20915
- 1918: 20916 – 22925
- 1919: 22926 – 24804
- 1920: 24805 – 27584
- 1921: 27585 – 28820
- 1922: 28821 – 29704
- 1923: 29705 – 30673
- 1924: 30674 – 32713
- 1925: 32714 – 34505
- 1926: 34506 – 36849
- 1927: 36850 – 38576
- 1928: 38577 – 39844
- 1929: 39845 – 41577
- 1930: 41578 – 42531
- 1931: 42532 – 42585
- 1932: 42586 – 42587
- 1933: 42588 – 42626
- 1934: 42627 – 42659
- 1935: 42660 – 42776
- 1936: 42777 – 42874
- 1937: 42875 – 43785
- 1938: 43786 – 43950
- 1939: 43951 – 44647
- 1940: 44648 – 44935
- 1941: 44936 – 45655
- 1942: 45656 – 46551
- 1943: 46552 – 47541
- 1944: 47542 – 47949
- 1945: 47950 – 49595
- 1946: 49596 – 51613
- 1947: 51614 – 53517
- 1948: 53518 – 55550
- 1949: 55551 – 56704
- 1950: 56705 – 57014
1950
- 56705 – 56716
- 56758 – 56811
- 56842 – 56877
- 56889 – 56906
- 56925 – 57014
- 9/10 RS L.E.P.
- 56717 – 56734
- 56747 – 56756
- 568121 – 56841
- 56883 – 56888
- 9/10″ RSQ L.E.P.
- 56735 – 56746
- 7″ RBG
- 56757
- 56878 – 56882
- 56907 – 56924
1951
- 9″ ML
- 57015 – 57050
- 57093 – 57188
- 57289 – 57408
- 9/10″ RS
- 57051 – 57092
- VZ SSE VALJOUX
- 57189 – 57288
- 6/7″ R L.E.P.
1952
- 13″ VZSS VALJOUX
- 57457 – 57534
- VZSSC
- 57535 – 57556
- VALJOUX
- 61000 – 61099
- 9/10″ RS
- 57557 – 57616
- 57641 – 57700
- 57754 – 57813
- 57874 – 57909
- 61155 – 61187
- 9″ ML
- 57617 – 57640
- 57701 – 57722
- 57724 – 57753
- 57814 – 57873
- 57916 – 57963
- 57982 – 57999
- 61101 – 61154
- 61188 – 61247
- 8″ MN 15/12 LeC
- 57723
- 17 JVEB LeC
- 57910 – 57915
- 61249 – 61254
- GHSMD LeC
- 61248
- 61256 – 61263
- 6/7
- 57964 – 57981
- 7JNN LeC
- 61100
- 7, 5/12 Ch. P.
- 61255
- 10 TS LEP
- 61264 – 61343
- 6/7
- 61344 – 61395
1953
- 2001 LeC
- 58000 – 58699
- 2002 LeC
- 59500 – 59699
- 2003 LeC
- 60000 – 61149
- 2499 LeC
- 61396 – 61595
- 9″ ML
- 61896 – 61955
- 62456 – 62485
- 62616 – 62645
- 62747 – 62776
- 62842 – 62931
- 63083 – 63112
- 63213 – 63242
- 63247 – 63276
- 17″ JVEB
- 63243 – 63246
- 2498 LeC
- 61956 – 62055
- 13″ VZSS
- 62486 – 62615
- 63277 – 63376
- VZSSC
- 62932 – 63081
- 62647 – 62746
- 10″ TS
- 62777 – 62841
- 18″ LEP
- 63549 – 63552
- 7″ JNN
- 62646
- 8/9 JN
- 63082
1954
- 2001 LeC
- 58700 – 59199
- 2003 LeC
- 60150 – 60649
- 2005 LeC
- 63113 – 63212
- 9 ML
- 63489 – 63548
- VZSSC
- 63553 – 63652
- 6/7 LEP
- 63747 – 63800
- 9″ L 406
- 63703 – 63712
1955
- 2001 LeC
- 59200 – 59499
- 64811 – 64910
- 65011 – 65110
- 2002 LeC
- 59700 – 59799
- 2003 LeC
- 60650 – 60999
- 63801 – 64400
- 2499 LeC
- 61596 – 61695
- 2498 LeC
- 62056 – 62155
- JVEB
- 65811 – 65822
- VZSS
- 66138 – 66184
- JVB
- 65823 – 65834
- VZSSQP
- 66135 – 66137
- VZSSC
- 66185 – 66234
- JVEB
- 64805 – 64810
1956
- 2002 LeC
- 53800 – 59899
- 2499 LeC
- 61696 – 61795
- 2498 LeC
- 62156 – 62255
- 2003
- 64401 – 64800
66241 – 67240 - 2001
- 64911 – 65010
- 65111 – 65320
- 2005
- 65835 – 65934
- ISMCCR VQ
- 66235 – 66236
- 16″ JVB
- 67241 – 67246
- 67347 – 67350
- VZSS
- 67247 – 67346
- 7 R LeC
- 69151 – 69250
- VZSSC
- 69251 – 69350
- JVEB LeC
- 69351 – 69360
1957
- 2002 LeC
- 59900 – 59999
- 69361 – 69460
- 2499 LeC
- 61796 – 61895
- 2498 LeC
- 62256 – 62355
- 2001 LeC
- 65321 – 65410
- 71871 – 71970
- 65411 – 65810
- 2005 LeC
- 65935 – 66134
- 2003 LeC
- 67351 – 68350
- 69861 – 70260
- 2499
- 68651 – 68750
- VZSS
- 72971 – 73010
- 73017 – 73020
- VZSSQP
- 73011 – 73016
1958
- 2498 LeC
- 62356 – 62405
- 62416 – 62455
- TOURBILLON
- 64803
- 13-JMV
- 64804
- 6/7 LeC
- 64801 – 64802
- 2005 LeC
- 68351 – 68550
- 2499 LeC
- 68751 – 68850
- 2002 LeC
- 69461 – 69560
- 2003 LeC
- 70261 – 71970
- 73671 – 73770
- 2001 LeC
- 71971 – 72370
- 7″ 2420 C
- 72871 – 72970
- VZSSE
- 73571 – 73670
1959
- JVEB LeC
- 66237 – 66240
- 2005 LeC
- 68551 – 68650
- 2001 LeC
- 72371 – 72770
- 2003 LeC
- 73771 – 74670
- 75671 – 76370
- 2070 LeC
- 74671 – 74770
- 2071 LeC
- 75171 – 75270
- VZSSC
- 80071 – 80170
1960
- 2002 LeC
- 69561 – 69760
- 2001 LeC
- 72771 – 72870
- 2071 LeC
- 75271 – 75470
- 2003 LeC
- 76371 – 76670
- 76671 – 78670
- 78971 – 79670
- 2001 LeC
- 76671 – 77270
- 2005 LeC
- 78671 – 78770
- 2426 LeC
- 79971 – 80070
1961
- 2002 LeC
- 69761 – 69860
- 2070 LeC
- 74771 – 74810
- 2071 LeC
- 75471 – 75670
- 2001 LeC
- 77271 – 77670
- 2005 LeC
- 78771 – 78970
- 2003 LeC
- 79671 – 79970
- 81401 – 82300
- 80171 – 81170
- 2001 LeC
- 82401 – 82700
- 2426 LeC
- 85101 – 85200
- 81301 – 81400
- 2072 LeC
- 85701 – 85800
- 2071 LeC
- 85801 – 85900
- 2050 LeC
- 81101 – 81300
1962
- 2003 LeC
- 82301 – 82400
- 83801 – 84800
- 86901 – 88500
- 2001 LeC
- 82701 – 83300
- 2005 LeC
- 84801 – 85000
- 2002 LeC
- 85201 – 85300
- 2050 LeC
- 86601 – 86900
- 88901 – 89000
- 2426 LeC
- 91401 – 91500
1963
2001
- 83301 – 83400
- 93701 – 94100
- 93501 – 93600
- 2005
- 85001 – 85100
- 2071
- 85901 – 86000
- 2072
- 86311 – 86500
- 2003
- 88501 – 88900
- 90201 – 91100
- 89401 – 89900
- 2050 LeC
- 89001 – 89100
- JVEB
- 73081 – 73083
1964
- 2072
- 86501 – 86600
- 94801 – 95100
- 2050
- 89101 – 89400
- 2003
- 89901 – 90200
- 91101 – 91400
- 91501 – 91700
- 91801 – 92700
- 2001
- 93601 – 93700
- 94101 – 94400
- 2005
- 94501 – 94700
- 2050
- 95601 – 95700
- 18/12 LEP
- 73084
1965
- 2071
- 86001 – 86100
- 2003
- 91701 – 91800
- 96711 – 97510
- 92701 – 93500
- 2001
- 94401 – 94500
- 2005
- 94701 – 94800
- 2001
- 95101 – 95400
- 2050
- 95701 – 96100
- 98711 – 98910
- 2005
- 96401 – 96600
- 2072
- 96101 – 96200
- JSMCCRVQ
- 99211
1966
- 2002
- 85301 – 85400
- 2001
- 95401 – 95600
- 99621 – 99920
- 2005
- 96601 – 96700
- 99221 – 99420
- 2003
- 97511 – 98710
- 100621 – 101320
- 2050
- 98911 – 99210
- 100121 – 100520
- JSMCCRVQ
- 99212
- 17″‘ IW
- 102621 – 102640
1967
- 2072
- 96201 – 96400
- 2005
- 99421 – 99620
- 2001
- 99921 – 100120
- 103641 – 103740
- 2050
- 100521 – 100620
- 104141 – 104740
- 2003
- 101321 – 102620
- 105171 – 105570
- 17″‘
- 102621 – 102600
- 2120
- 102641 – 103540
- 107271 – 107370
- 17″‘
- 105141 – 105170
1968
- 2002
- 85401 – 85500
- 2001
- 103741 – 104040
- 2050
- 104741 – 105140
- 108671 – 109070
- 2003
- 105571 – 107070
- 2423
- 107171 – 107270
- 2120
- 107371 – 108670
- 109671 – 109870
- 2005
- 110201 – 110300
1969
- 2002
- 85501 – 85700
- 2001
- 104041 – 104140
- 111501 – 111800
- 2003
- 107071 – 107170
- 110501 – 111500
- 113001 – 114000
- 2050
- 109071 – 109670
- 115301 – 116000
- 2120
- 109871 – 110170
- 112001 – 112500
- 116501 – 116700
- 2005
- 110301 – 110400
- 116301 – 116400
1970
- 2001
- 130901 – 131100
- 111801 – 112000
- 120502 – 120800
- 124581 – 124680
- 2120
- 112501 – 113000
- 115701 – 117200
- 122881 – 123080
- 125601 – 125700
- 2003
- 114001 – 114900
- 118201 – 118700
- 120001 – 120200
- 120826 – 120875
- 2050
- 116001 – 116300
- 117201 – 118200
- 123281 – 123380
- 123781 – 123880
- 2430
- 112401 – 116500
- 2002
- 120201 – 120400
- 2121
- 120801 – 120812
- 120881 – 121780
- 127001 – 127100
- 13″‘ 77
- 120821 – 120825
- 8/9 JN
- 125081 – 125180
- JSMCCRVQ
- 120876 – 120878
1971
- 2001
- 131101 – 131400
- 124481 – 124580
- 124681 – 125080
- 2003
- 118701 – 120000
- 128901 – 129300
- 2002
- 120401 – 120500
- 2121
- 121781 – 122880
- 126901 – 127000
- 127101 – 127200
- 2120
- 123081 – 123280
- 125301 – 125600
- 125701 – 126100
- 2050
- 123381 – 123780
- 123881 – 124080
- 17″‘ 5017
- 125181 – 125212
- 2430
- 126301 – 126600
- 126601 – 126800
- JSMCCRVQ
- 120879 – 120880
1972
- 8/9 JN
- 110171 – 110172
- 2003
- 129906 – 130900
- 2001
- 131401 – 131500
- 2050
- 131501 – 131600
- 2001
- 132501 – 133100
- 2120
- 1331012 – 133600
- 2002
- 134201 – 134400
- 5017
- 134401 – 134500
- 2003
- 134501 – 134600
- 2001
- 134601 – 135600
- 2120
- 135601 – 136100
- 2001
- 139101 – 139400
- 2050
- 124081 – 124280
- 2120
- 126101 – 126300
- 2121
- 127201 – 128400
- 2003
- 129300 – 130900
- 17″‘ JSMCCRVQ
- 120816 – 120817
- 17″‘ JSMV
- 120824 – 120825
1973
- 2050
- 131601 – 132500
- 2003
- 135101 – 137200
- 2001
- 137201 – 138100
- 2120
- 138101 – 138600
- 2121
- 138601 – 139100
- 2001
- 139401 – 141100
- 2121
- 141101 – 142700
- 2002
- 142701 – 142800
- 2001
- 142801 – 143300
- 2002
- 144101 – 144200
- 2050
- 144201 – 144300
- 2121
- 145301 – 145500
- 2120
- 147901 – 148000
- 2003
- 154101 – 154200
- 2121
- 128401 – 128900
- 17″‘ JSMCCRVQ
- 120818
1974
- 2001
- 143301 – 144100
- 2050
- 144301 – 145300
- 2121
- 145501 – 147900
- 2120
- 148001 – 149400
- 2001
- 149401 – 151300
- 2510
- 153501 – 153565
- 153581 – 153600
- 5017
- 154001 – 154100
- 2003
- 154201 – 156200
- 2120
- 156201 – 156700
- 2121
- 158001 – 158100
- 159301 – 159600
- 2003
- 160301 – 161000
- 5017
- 164401 – 164500
- 2050
- 164501 – 164900
1975
- 2001
- 151301 – 153300
- 2002
- 153301 – 153500
- 2510
- 153567 – 153578
- 153601 – 153750
- 2120
- 156701 – 157800
- 2121
- 158101 – 159300
- 159601 – 160100
- 2003
- 161001 – 163300
- 2050
- 164901 – 165100
- 2052
- 165101 – 165800
- 2001
- 166601 – 167600
- 2003
- 170801 – 170900
- 2430
- 126801 – 126900
- 5017
- 175401 – 175416
- 175481 – 175500
