Some of the numbers indicate the year that the model was introduced (not necessarily built) as the last two digits. These followed no logical pattern and were more akin to a model number than a unit-specific designation. Type 1: The first serial number system began in 1939, although not all machines had them that year. Early machines did not have any serial numbers. With respect to serial numbers we can divide Walker-Turner's existence into five epochs: Introduction ¶The information below is taken from a Walker-Turner service bulletin that dates from about 1961.
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