Chronometer Certificates (1956s - 1960s)
Serial Numbers
Size
Watch Models
ca. 100K to ca. 1M
3 7/8" x 2 5/8"
(9,8A x 6,6 cm)
Chronometer rated watches:
5508, 5512, 6610, 6538, 6536, 6542, 1675, 6541.
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