Not much information can be found on Wingo, except for a handful of different watches from the 1960s. For this chronograph, it seems the French company Yema supplied it, given the similarity with its Yachtingraf model, which was also signed LeJour for the U.S. market. They very obviously share the specific looking regatta counter on the right side of the dial, but the 9312 engraved on the inner caseback is a good clue as well, since it was a reference number for the Yema chronographs equipped with the caliber Valjoux 7730, back in 1967. Furthermore, the digits on the outer side of the caseback (without embossed logo) match the numbering system in use for the serial numbers of that period.
The watch is described in excellent condition, with an unpolished case and a great bezel, although the listing does not mention the partially missing lume on the minute hand. The dial is in great condition, with a very legible 5-minute countdown on the oversized counter, a crucial indication before the start of a boating race. The winding crown has a similar shape to those observed on the Yema Yachtingraf and Rallygraf, so it is likely original to the watch, while the chronograph movement Valjoux 7730 is said to work properly.