18.5 is way extreme on this watch. I have a 092 Arktos and it feels wayyyyy thicker than my 253. Way lighter as well and really just feels a lot smaller in general. The only way they could have measured this is on the dome crystal, because the Arktos feels so much weighty and thicker than the 253. If you have reservations I can truly tell you that the 253 feels much smaller and sits a lot lower than an arktos at least and with my 7 inch wrists it feels just right...go for it, by far my favorite rep and the one I get the most questions about.
Smokey