I have a Hamilton 630 movement being serviced on my bench right now which looks very similar as well, except that the train bridge is marked "Hamilton Watch Co " instead of the stylized Hamilton "H". Here's an old image of my movement (sorry - ugly quality) and it's home, before the case refinishing.

The Heuer cal 11 is based on a slightly different Buren movement, which has some extra wheels on top of a differently shaped train bridge and a different train wheel with an arbor to drive the chronograph module. The winding bridge between the microrotor and the mainspring barrel is also differently shaped.

Here's a link to a very large image of the cal 11 movement which clearly shows the differences:
Heuer/Hamilton/Bulova movement