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Like the flightmaster, the Mark 3 can come in either finish. My Mark 3 has the horizontal finish:
oh, thank you!
Flightmaster comes originally with horizontal finish only in last reference .036.
How can I presume that horizontal finish is original in Mark3? Perhaps about production year?
I haven't yet determined if there is a way to pinpoint when a Mark 3 should or should not have one finish or the other.
Flightmaster .036 would should have been produced after 1972.
Your Mark 3 prepro should have been produced before 1974.
So, may we suppose that Omega used circular finished cases for Mark 3 in 1973 (34.xxx.xxx serials)?