Buben & Zorweg Grand PrecisionLocking Mechanism Swiss made Kaba security lock and mechanical key Signature Clock PRECISON PENDULUM CLOCK by Erwin Sattler BUBEN&ZORWEG Manufacture movement Caliber Alpha 01 Pendulum World Time Dead beat Graham escapement with pallets made of hardened steel Seconds pendulum Main wheel with constant power and remontoire World time indication Weight drive (3,000 g) with a ball bearing deflection roller 31 day power reserve Fine polished, gold plated