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Bureaux Suisses Timing Certificates (1950s - Late 1960s)
Serial Numbers Size  Watch Models
ca. 100K to ca. 2M 8.25" x 11 5/8"      
(20,9 x 29,5 cm)
Chronometer rated watches: 5508, 5512, 6610, 6538, 6536, 6542, 1675, 6541, 1019

 

Bureaux Suisses Timing Certificates (1950s - Late 1960s)
Serial Numbers Size  Watch Models
ca. 100K to ca. 2M 8.25" x 11 5/8"      
(20,9 x 29,5 cm)
Chronometer rated watches: 5508, 5512, 6610, 6538, 6536, 6542, 1675, 6541, 1019