Here is a simple movie showing the Calibre 50611 movement in the early ref 5021 Portuguese Perpetual Calendar. I shot it today with a Movie Camera - and saved as a 4-frame GIF.
Since 2003, when the Ref. 5021 PPC was introduced, I believe there have been 3 different movement calibres used:
50611 - as seen in this movie is a 64-Jewel 2.5Hz (18,000 bph) movement. The interesting thing about my 5021 here is - you note the bridge says "SIXTY-SIX (66) JEWELS". IWC never made a 66-Jewel PPC - the cal. 50611 is 64 Jewels. According to some research I did with IWC, they first few dozen bridges made when the 5021 was introduced were engraved "SIXTY-SIX (66)" - and they used them on earliest 50611s before correcting the "error".
The 50612 came out shortly after the Yellow Gold/Silver dial ref. 5021 was discontinued in the first year - it is a 3Hz (21,600 bph) movement.
Calibre 51613 - 62 Jewels, 3Hz (21,600 bph) is in the latest 5021 which includes the Blue Dial White Gold, and Rose Gold/Black Dial introduced at SIHH 2010 includes the
Best regards,
Richard
