A COA begins with complete disassembly of the watch and movement. Parts are put through a series of ultrasonic cleaning machines. Pivots are inspected with a 10X loupe and burnished if necessary. Jewels and bushing are pegged by hand with sharpened pegwood. Endshake and sideshake are checked and adjusted as necessary. High quality (Moebius, PML, Molykote, etc.) horological oils and greases are applied as the watch reassembled. A COA includes light case polishing and new generic case includes light case polishing and new generic case back gasket. A new mainspring and additional gaskets may be installed for an additional charge. More involved case and/or bracelet refinishing is also available at an extra charge. Following assembly, the watch is tested and adjusted in multiple positions to ensure adequate balance amplitude, beat, and daily rate.