IWC caliber 98300
The IWC manufacture 98300 calibre is almost identital to the 98295 calibre.
The Vintage Collection Pilot's Watch has a thicker dial and therefore more clearance is needed. Its cannon pinion is a few millimeters taller, even though the movement itself has the same height in specifications.
The case construction of the Vintage Pilot (IW3254) needed more height than the Vintage Portuguese (IW5445) and the dial was part of that design. That in turn caused a one part replacement and cal. 98295 became 98300.