The WS number is the WIRING SCHEDULE identification
of a particular instrument.
Wurlitzer used numbers starting from 500 to identify the
wiring diagrams for their instruments. There was a WS for
each of the standard styles
and special WSs were created for each special order or
variant to the standard styles. Not all WSs that were
designed were actually built.
The WS number was written on each stop switch in the
relay of each instrument providing a way to identify
those instruments that still have their original relays.
Although many instruments may have been built to one
WS there were many specials that had unique numbers which
enable positive identification of those instruments. The
OPUS number was rarely found on an instrument.
The first 200 intruments had the job number and style
stamped on the low C of each rank of metal pipes.
List of WS numbers