I have an vintage Heuer up/down chronograph with a strange Heuer logo. I posted some pictures of the watch a couple of years ago at the Heuer forum, but no one had an answer. I have since then tried to collect as much info as possible, and have found some information. I have seen some claims that this was a military model, and most owners date them to late 1930's (1938) or very early 1040's.
The movement is the same on all 2HEUER2 I have found. A unsigned Venus 170. I know that Heuer produced an up/down chronograph with Valjoux 77 later, that is fully signed. None of the Val.77's that I have seen has the 2HEUER2 logo. The 2Heuer2 has Nickel case, the later Valjoux 77 has steel case.

THE ANSWER

I have just found a Heuer advert from 1942 that shows the little chronograph. This is the first time ever, I have seen any information about these chronographs. The are not military, but Heuers cheapest chronograph offer.

In the down left corner of the ad. is a little black up/down chronograph with the 2Heuer2 logo. It is listed as Ref. 3249 Nickel/Steel case back priced at Fr. 93,- It seems like it was a low-price model. A regular left/right steel chronograph with Valjoux movement was Fr. 198,-

There is at least two different dial design for Ref.3249, one with telemeter and tachymeter, and one, like mine, with a seconds scale.

This should confirm that these are genuine early Heuer Chronographs. Heuer did not sign all movements until 1945.

See my Heuer blog http://classicheuers.blogspot.com/

Jarl