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In such cases, other factors and information must be used to determine the date. From 1926 through 1949 (in most cases), the year of the case can be determined from the first digit of the case serial number.
Watches dated post 1949 have a 2 alpha-numeric date code on the outside backcase, whilst watches dated before 1950 usually contain a date code symbol on the inside movement (see below for examples).
Dating Bulova watches that appear to pre-date 1926 is far more complicated and uncertain.
Starting in 1950 (with a few examples even earlier), the case and movement have a two-digit code that identifies both the decade and year within that decade according to the table below.
The Romans acquired it during the Hellenization that occurred in the Roman Republic.
The Romans turned the Greek form into a standard -a declension noun, amphora, pl.