Cannot verify it but this just is not a Heuer..............
Text on bridge does lookes fakely engaved and case and dial is just not Heuer in any way for me.
My guess case is not signed?
Has no similarities with any other Heuer from the 40´s - 50´s that i have seen.
I think establishing authnticity with Tag Heuer themselves will be only way to establish authentic or fake and i´m 100% sure they will say its a fake.
Case,Crown,Dial,Hands,Small hands,Caliber of movement in short everything is not Heuer!
From my standpoint its a fake probably put together in South America but i can´t verify.
Cheers,Par