Congrats on the 1815 chronograph. I think it isn’t a thick watch, it actually sits quite nicely. My wrist is less than 6.5 inches and I own the datograph. So from my perspective the 1815 chronograph is a superb piece to own...an everyday chrono. Fwiw, I like the 3rd generation a lot too. The sub dials on the 1st generation feels a bit smaller relative to the dial, and the 2nd generation dial layout doesn’t appeal to me naturally. However, I must confess I have not spent enough time with the earlier variants. They, I must believe, should all have some merits.
Best Regards
Gatsby