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The movement is an early Valjoux 22, with an unsigned bridge. This is no problem, several early Heuers have unsigned movements. From 1945, Heuer signed all movements.
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In a 1938 Heuer catalogue I found the movement listed as ref. 349.
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In a 1945 Heuer catalogue I found the right case. There's only on problem, they are listed as steel case, and have wrong ref. number. But over the three there is listed a ref.349 with Nickel Case - steel back. No picture. This matches my chronograph, Val.22 and Nickel Case, steel caseback. My watch has the same shape of the case, pushers and crown.
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I think I have a match, and that this is a Ref.349 dated from somewhere between 1938 to the mid 1940's.