Here is an interesting listing of a chronograph that seems to be co-branded, Heuer and Levrette -- http://www.ebay.com/itm/390768962234

Seller suggests that "Levrette" was an old local retailer jewelry and watch shop, but some quick eBay research suggests that Levrette was a watch brand, located in La Chaux-de_Fonds.

So we are left to wonder: (a) was Levrette a small watch brand that called on the local company, Heuer, to produce some chronographs or (b) has someone added the Heuer shield to this Levrette chronograph? For what its worth, the Heuer marking on the movement looks a but dodgy (and I'm also not sure the geometry on the Heuer shield on the dial is quite right).

Jeff