1. Bulgari Octo Finissimo Minute Repeater
Thickness: 6.85 mm
2. Jaeger-LeCoultre Hybris Mechanica 11 (Master Ultra Thin Minute Repeater Flying Tourbillon)
Thickness: 7.9 mm
3. Vacheron Constantin Patrimony Ultra-Thin Calibre 1731
Thickness: 8.09 mm
4. Audemars Piguet Royal Oak Minute Repeater Supersonnerie
Thickness: 8.4 mm