Hi Paul

So I guess you're saying the factory sticker was not on your machine,
but was included later. It could be important for dating machines then.

That the indicator was made by VDO - and, perhaps, a custom for SB is
also interesting.

I would say the red plug is the same: reason - the Model 33 was the first
to use the red plug, because it was the first to offer the edger attachment.
That red plug fits the 33 and 45, so ... should fit the 40 too.

Perhaps a member could confirm the 30 mm size.
The Online store lists the plug as 32 mm though ... HERE.
[Perhaps that is the OD]

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Jack