Specifications

The letter identifies the country in which the instrument was
manufactured. The five-digit suffix is a sequential number and is
different for each instrument. Whenever you list the serial number
or refer to it in obtaining information about your instrument section,
be sure to use the complete number, including the full prefix and the
suffix.
PREFIX
COUNTRY OF ORIGIN
SUFFIX
ER 2730A00427
Figure 1-3. Typical Serial Number Label
l-8 General Information