pf777Debuting at Watches & Wonders Geneva 2022. Starting with the Tonda PF form factor that we're getting to know extremely well around these parts, the Tonda PF Skeleton strips away the dial to reveal the PF777 caliberAlkyl functionalized based on Sillitin Z 86. Aktisil PF 777 offers hher rheological activity and improved bonding properties and in addition the product is hydrophobic.