Not strange, or unusual. Many well-known Swiss brands shipped movements with dial and handsets to be cased in various countries, including France the UK, and the US. Very common for Omega as well. The watch wasn't "made" in France, but it was cased there, which is a final step of assembly. Yes, the dial doesn't indicate anything different, however, usually the name of the local case-maker is indicated inside the case-back, which is not present here. So (again as noted above) that could be cause for concern if the archives indicate that this movement was cased in France. To generalize greatly, they are usually not quite as desirable as an equivalent all-Swiss watch, but it's a bit hard to compare.
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