Thanks! I love engine turned guilloché dials too. It's 36 mm from 2002-ish. My wrist is about 6.75". Macro seems to have quite a fish eye enlarging effect on my camera so I can see why you thought it was 38. Don't know whether it's because of the optics or my shooting habits.
Made a swap at high noon today to the '66 Constellation 168.009 caliber 561: Please excuse the mediocre iPhone shot. It's the only camera I have at work.
I don't like them much either, but if I want to post on multiple forums it's the best option. The pic on your reply was edited to soften the harshness a bit and I replaced the old with the new in my post. I can upload one directly though: