Cal 1001 Clarification ?

Hello fellow Hour Loungers - can someone help to clarify a question I have.I have been looking at a 1950's cal 1001.However,the movement shown within the case is clearly marked 17 jewels and 1001 - not 1001/1,or 1001/2 - yet it has a sub-seconds arrangement on the dial.The seller appears genuine and is a member of the NAWCC and other professional bodies.Is this correct,or do sub-secs need the 1001/1,or 1001/2 nomenclature ?

Thanks Dr Strangelove
07/20/2009 - 03:39
Cal 1001 was available with 17 or 18 jewels and had a sub-seconds dial arrangement.  Cal 1002 was based upon the 1001 with the addition of center sweep seconds, also with 17 or 18 jewels.  The addition of center seconds on the 1002 swelled it's height from 2.94mm to 3.44mm.  Hope this helps .
Re: Answers
07/20/2009 - 23:16
Thanks Dean, As always,to outsiders,this sort of detail seems trivial,but with so many dodgy 'frankenwatches' out there,one has to check these details are correct and not for the last time,may I concur with my fellow HL's that your knowledge is profound and that your follow up posts on VC based calibres will have also been well received by other members. Thanks Dr Strangelove
Re: Cal 1001 Clarification ?
07/20/2009 - 10:04
Dean is correct, the 1001 and any of its variations have small-seconds, while the 1002 (and all of its variants) have center-seconds. I believe the 1001/1 (or is it the /2?) designation indicates that it uses a free-sprung, Gyromax balance.  Both 1001 and 1002 are based on JLC ebauches (818/819 I believe) and were used by VC and AP only. BR, Dan
VC Base Calibers
07/20/2009 - 18:05

Thanks Dan for adding more info.  Here is a list I posted on the "other" forum which THL'ers might find useful.  Corrections or additions are appreciated . VC 452 (sub seconds) based on JLC 452. VC 453 (sub seconds) and 454 (center seconds) based on JLC 449. VC’s first automatic caliber 477 based on JLC bumper-winding caliber 476. VC’s first rotor winding caliber 498 (center seconds) and 499 (sub seconds) based on JLC 493 and exclusive to VC and Audemars Piguet. Developed into VC caliber 1019. VC 1001 (sub seconds) based on JLC 818. VC 1002 (center seconds) based on JLC 819. Both exclusively for VC and Audemars Piguet. VC extra-flat caliber 1003 based on JLC 803, exclusively for VC and Audemars Piguet. VC improved automatic caliber 1070 (sub seconds) still based on JLC 493. Developed into VC caliber 1071 (center seconds) and 1072 (date) and 1072/1 (Gyromax balance). VC extra-flat automatic caliber 1120 with Gyromax balance based on JLC 920 ebauche, exclusively for VC, AP and Patek. This was followed by VC 1121 with date. VC Chronometre Royal automatic caliber 1096 based on JLC 906. VC Chronometre Royal manual caliber 1007/BS (sub seconds) and 1008/BS (center seconds) based on JLC 478/BWS. VC chronometer caliber 1310 and 1311 based on Girard-Perregaux 3100. VC 1145 based on Lemania 1872. VC 2-register chronograph caliber 1140 based on the Lemania 2320. VC 1141 based on Lemania 2310. VC’s vintage 2-register chronograph caliber 434 based on Valjoux caliber 22. VC caliber 492 based on Valjoux 23. VC 1125 based on JLC 891 VC 1126 based on JLC 889 VC rectangular caliber 1017 based on JLC 822. VC 3-register automatic chronograph caliber 1137 based on the Frederic Piguet 11.85. VC 1190 based on F. Piguet automatic caliber 9.51 VC 1206 based on F. Piguet automatic caliber 11.50. VC 1132 based on F. Piguet manual caliber 8.10.

As always Dean, you are a great source of this type of detailed info!
07/20/2009 - 18:41
A lot of my information comes from what you have posted in the past and this post gives me the opportunity to say "Thank You".  I've learned a tremendous amount over the past couple of years and hope to continue my VC and general watch knowledge education over the years. Best Regards, Dan
agree with you 100%, thank you for all Dean :-) (nt)
07/20/2009 - 18:53
Aw shucks guys...
07/21/2009 - 00:10
  I'm only glad that others share my fascination with these details!  Part of Vacheron's charm to be sure .
That is amazing and mostly useful information
07/23/2009 - 15:11
That is amazing and mostly useful information Dead. Thank you very much Marios