There is also a small variation on the second version. Look at this dial on one of mine; the Heuer shield is much smaller - is placed after the end of the first "A" and ends just before the last "A", whereas in the one you picture the Heuer shield overlaps the first and last A. Also the font is subtely different - small or non existent serifs on this version...

Here's an overall view of the watch. The orange tropic strap was just an experiment; it was fun for awhile but I then settled back on a more conventional corfram style strap....