Odds are that this is a 1680 with a replacement dial that is either aftermarket, or an obscure service dial that I don't recognize. Aside from that, I like it. In particular, I actually think that the case looks quite good given the history of the watch. Yes it shows a lot of wear, but the chamfers are visible, and the lugs and crown guards are thick. Once we know the serial and reference numbers, we can perhaps give your colleague some advice about options. Obviously, keeping it as-is is a possibility, but he could also consider other options, including finding a period-correct dial to install, or an authentic service dial.
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