3.65mm thin
Beaten by the new Piaget Altiplano Ultimate Concept at 2mm thin of course.

A side profile.

Some of my other thin watches are the JLC MUT perpetual and Cartier Tank Louis Cartier Ultra Thin (powered by Piaget's 430P movement)



And some pics of the Altiplano Ultimate Concept. Watch is not mine. Looked at it in the Piaget boutique. 2mm thin!!


Cheers
Robin