Seiko

The dial, insert (outer bezel), indicator ring (inner rotating bezel), hands, and crown look original to me, which is to say, nice find! These are increasingly difficult to come by. 

The reason I mentioned that it was not an early production is that some people are particularly interested in "the great race of 1969", where Heuer, Zenith, and Seiko all competed for the title of world's first automatic chronograph. The dispute is ongoing, but by post accounts is seems Zenith marketed their El Primero earliest, but Seiko actually produced their 6139s and sold them the earliest. These first productions runs of the 6139 have certain characteristics that later versions do not (slightly different dial, slightly different case, slightly different case back, etc). Actually, Colonel Pogue himself did not wear a first generation 6139 (he wore a 2nd generation). Yours is the 3rd (and final) generation. 

Now that I hear and see more about your bracelet, I am inclined to think it is original, especially if your watch was produced after 1975, because this is when the tapered "oyster" (these are not really oyster, but rather "H" bracelets) were first introduced. Prior to '75, the 6139 oyster bracelets were straight, with no variation in width from lug to clasp. "Z" would put the bracelet at the end of the 1970s I believe, which lines up with about the time your watch was produced. Great!

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