46.0mm diameter 15.5mm height
51110 (2005), 51111 (2006)
Brown Buffalo Strap with Rivets and Cream Stitching
Starting in late 2005 early 2006, IWC introduced the new calibre 51110 in the original big pilot with a higher 3Hz movement. This was for a brief period of time before the redesigned IW500401 was publicly released later in 2006. These 5002s with a higher-beat movement are called 'transitional' BPs. There is no known record of how many transitional BPs were manufactured. Various collectors believe 5002s with a serial number 314XXXX and higher are these 'transitional' BPs, however the only way to verify the movement is with time-lapse photography of the second hand movement. A Probus Scafusia marking on the crown (instead of the original fish) on a BP is not confirmation of a transitional BP because IWCs normally replace fish crowns BPs with Probus Scafusia crowns (unless specifically requested not to).
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