Steel cased Longines imported to the US at that time generally had Swiss made cases, since there was little to no customs duty placed on them. It is also possible that the entire watch was cased in Switzerland and imported whole, since I do not see the “LXW” import code on the movement.
The archivist at Longines probably saw “USA” in the records and assumed that the movement was sent separately, as was the usual practice in the 1940’s.
The dial looks like a modern repaint. It does not match the rest of the watch.
Hope this helps,
gatorcpa
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