Hi all,
On behalf of my fiancee's father, I'm asking for opinions/comments on this piece that was recently found among a relative's things - both myself and my future father-in-law have some some research (although not by any means extensive) and it seems to be a cross between the Reference 2447 and Reference 347 1940's Heuer Chronographs according to OnTheDash - it has the dual-dials and round push-pins of the 347 but the logarithmic outer scale of the 2447.

It also seems to be related to the 1935 'Flieger' two-button chronograph, but those don't seem to have the outer scale either (at first glance the Flieger's seem to be rebadged 347s?).

We cannot find any photos of an identical piece, so we're very curious to see if anyone can fully identify it! The piece is currently with a shop for restoration/valuation, but I managed to take some photos before I dropped it off:

Any help/comments are much appreciated!

Craig