IWC Portuguese 7 Day caliber 51010 vs caliber 51011

IWC Shaffhausen has come a long way from their American beginnings in 1868. Yes, International Watch Company (IWC) was started by Florentine Ariosto Jones in The United States in 1868. Florentine wanted to take modern American engineering and merge it with Swiss Craftsmanship. So he did just that by opening a factory in Schaffhausen Switzerland.

Approximately 100 years later the IWC Portuguese 7 Day power reserve was released. Through the past few years of the IWC IW5001 series there has been 3 different movements in the watch, In this article I will show you pictures of the caliber 51010 and the calibre 51011 and explain the differences. What does a "7 Day Power Reserve" mean? It means when the watch is fully wound the watch will keep running for 7 days without stopping. An average automatic watch will have a power reserve of approximately 48 hours. If you wear your watch everyday that still does not mean that it will always be running on a full or even half a tank of gas. With a seven day power reserve you can go several days with out wearing your watch and chances are when you go to wear it there will be plenty of power remaining. See my blog post "How an Automatic Watch Works."

The white dial and blue markers IWC Portuguese 7 day power reserve has the calibre 51010 inside.
The black dial 7 day power reserve Portuguese has the calibre 51011 inside.
The movement above is the calibre 51010 and runs at 3 Hertz and has 44 Jewels.
The movement above is the calibre 51011 runs at 3 Hertz, has 42 Jewels and modified "cogging.''
IWC Calibre 51010
IWC Calibre 51011
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Posted in IWC, Watch Reviews by Kyle O'Connor.