B-Uhren for Royal Navy??

One of my friends sent this link to me: Photo Report: IWC Ref 431 Big Pilot.

Here mentioned that:

I never heard that B-Uhren were delivered to Royal Navy. Is it right?

Hi Roman,
The writer is confusing the movement (cal.52T S.C.) with the watches it equipped.
IWC did indeed manufactured 1,200 cal.52T S.C. movements.
1,005 cal.52 S.C. movements were used in the Ref 431,the Luftwaffe Beobachtungsuhr. 1,000 Ref 431s were delivered to Siegfried Heindorf, Berlin in 1940, for the Reichs-Luftfahrtministerium for use of the Luftwaffe bomber squadrons for astro-navigation, and 5 were used for tests at IWC. I believe the Ref 431 was not used after the end of WWII.
195 cal.52T S.C. movements used in the Royal Navy HS3 deck watch. 190 HS3s were delivered to the Royal Navy and 5 were used for tests and at IWC. The Royal Navy kept using the HS3 deck watches until the 1980s, long after the end of WWII.

Thank you Antonio! It's clear for me now!

According to Justin Hast, writer and photographer, "Kang|Kono exists for one simple reason. To showcase the worlds finest gentleman's accessories."
Justin Hast seems to be a fashionista with only a scant understanding of horology.
His writings on the Spezialuhrfürflieger are also riddled with inaccuracies.
To his credit he seems to like vintage IWC military watches, which shows exceedingly good taste. :-)