Okay, I'll play too.
Well, a lot has been said about this piece (I'll call it a quiz watch for now) already and either way, it is a nice one and it appears to be a late 70s piece, either -76 or -78. That would match up with the early 1171 bracelet (trapezoid logo) as well as with the C4 case back. Sorry
@ibis888, I am afraid I disagree... It's hard to judge in the poor pictures, but the high middle peaks in the W's are easily spotted.
Apart from the nice dial, the case is what stands out to me and could be a giveaway regarding the reference. Given how sharp the case is and the fact that there are some points of wear, I am going to assume our quiz watch isn't polished and if it has been, it has been done very lightly. When one compares the 'feet' of the lugs (where the case lugs on the wrist) of the quiz watch case with the 145.022-78 shown above, it stands out that the surface area of the feet of the lugs is bigger (wider) on a 145.022-78. I can confirm one of my own 145.022-78's has the same, the case of a -78 seems a bit more beefy. So, I am inclined to believe this isn't a -78 but a -76. Note that it is pretty difficult to identify a 70s / 80s Speedy by its case profile with such poor side pictures.
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The colour of the lume is another reason I'm leaning towards a -76 rather than a -78... Many -78s, including the one shown above, feature a rather characteristic mint greenish lume. The quiz watch is more appealing to me.
Either way, cool 70s Speedy,
@hansaboy! And it will need a correct chronograph seconds hand.
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