51111 vs 51011

What is the major difference between the calibre 51111 in 5109-01 and the calibre 51011 in 5104-01?

Thx.

Hi BU8999,
The 51011 has a small seconds indicator @ 9. It can usually be found in Portuguese IW5001 models but has been used in some special edition IW5004 Big Pilots models.
The 51111 has a centre seconds indicator. It can only be found in Big Pilots models like IW5002, IW5004, IW5009 & IW5019.
I don't know of any IWC's with references 5109-XX or 5104-XX.
Leo

Hi Leo,

I have a question about 51111 and 51011 calibre. Is the rotor 51011 interchangeable with 51111? I'm asking because I'm not a big fan of gold medallion used in 51011 calibre.

Many thanks!