Ornatus-Mundi
[Zenith]
7136
A comparative pic between a chronometer-certified and a standard T-40...
which I found on the web:
(left, non-chronometer; right, chronometer version)
Note the difference in finishing as well as in the balance wheel and the hairspring stud. Furthermore, the chronometer version is individually numbered also on the barrel bridge.
Hope this helps!
Cheers,
Magnus
Old Zenith chronomete
what is this printing in dial between centre and small cecond?...
It stands for 40-T, one of Zenith's Observatory Chronometer movements...
It could find out the following: The Cal. 40-T is a 12" hand wound movement (thanks blomman for the pointer!) beating with 18.000 bph, produced between 1947 and 1963 in a quantity of 162.000 pieces. There were standard and chronometer-certified movements....
A comparative pic between a chronometer-certified and a standard T-40...
which I found on the web: (left, non-chronometer; right, chronometer version) Note the difference in finishing as well as in the balance wheel and the hairspring stud. Furthermore, the chronometer version is individually numbered also on the barrel bridge...