That size is a bit hard to shift, its well under what even skinny men wear, I think the 30mm Patek Ref 96 are really the smallest watch a block can get away with and this is another 2mm under that again.
need a picture of the back; inside and outside. to determine, if it is a heuer case. kind regards. achim
Here is a link to the best Heuer Chrono guide on the internet... http://onthedash.com/Guide/_Chronographs/ Take a look and make your own judgement. I will just say...be very careful! JohnCote