The 'Bulletin' was sent out to dealers in order
to keep them informed about progress with
manufacturing, and supplying the 600 range sets.
When these were first released the demand for sets
exceeded supply. There bulletins were also used
to keep dealers informed on various issues, e.g.
on service, and on the franchised dealer scheme.

The notes "AudioFair" and "ServiceNote" were each included
with an issue of the bulletin, but at present I
do not know which ones.