It was explained to me that on the world time the diameter cutout on the outer dial was much larger than the ones on the pictures shown above. I looked it up in Zaf basha's book and indeed you can see that the cutout goes all the way out to the date cutout leaving no room for hour marker at 3:00. see attached picture
The book also said the world time was observed (key word) only on the srewback case ref E856 using the manual wind caliber 814 and the snapback case ref 3160. Caution is advised for case ref other than the E856 and 3160
It was explained to me that on the world time the diameter cutout on the outer dial was much larger than the ones on the pictures shown above. I looked it up in Zaf basha's book and indeed you can see that the cutout goes all the way out to the date cutout leaving no room for hour marker at 3:00. see attached picture
The book also said the world time was observed (key word) only on the srewback case ref E856 using the manual wind caliber 814 and the snapback case ref 3160. Caution is advised for case ref other than the E856 and 3160