Hi Carlo, yes, it was the sun buckle originally on it. Just beware of fakes as there are now fake sun buckles that seem to be originating in Italy and are of poor quality. The sun buckles are not always easy to find and are not generally cheap.

: Which Heuer buckle would be original for this band? Was it the one
: with the sun dial on the back of the buckle? Sorry for all these
: questions, but I am getting educated with all of your help. If
: not the sun dial version (which I am curious what watch that was
: for), then which buckle would it be, b/c I have seen a few
: different versions.