zOwie Omega Discussion Forum

I have had the great fortune to purchase a c '1975 Omega Seamaster Automatic Calendar, 1040, that, completely unbeknownst to me, formerly belonged to my deceased son. No one in the family remembers it, but it came to light recently and I now have it. Has his name and SS on the back. I hope some day his young son might be interested in having it.

Of course, I don't have any papers or instructions at all, and there's no one here who can assist me.

At 9:00 on the dial, there is a sub-dial with two indicators, a continuously operating white one, the second hand, I'm sure, and a small orange pointer on another function dial below the white hand, with markings of 6, 12, 18, and 24 and other 2 hour interval marks. The upper half of this sub-dial is light blue, somewhat lighter in color than the main dial darkish blue color; the bottom half is grey. I think that represents the two halves of a day - day and night.
The pie plate tachmetre ring is white. It's a lovely watch, one of the very, very few chronographs I've ever seen that appeals esthetically to me. To think that this one, that appeals so much, was actually my son's, is mind-boggling.

There is also a small orange pointer in the 9 position subdial that is functioning. By pulling the stem out to the second stop, and resetting, I've been able to bring the orange pointer into sync with the main hour hand.

Is the orange pointer simply a 24 hour clock, or could this be a second time zone indicator? If so, how does one set it to function so it indicates an actual time, say, in the US while the main hour hand shows an international time?

Thanks for anyone's assistance.