Tasmanian "Paquebot" Handstamps

[Ross Ewington]

I recently noticed this cover in a "carton lot" whilst preparing it for disposal

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This pictorial SPIRIT OF TASMANIA datestamp was applied at the Devonport post office to mail
posted on board the ship.

There is no reason to apply a PAQUEBOT handstamp to domestic mail of course so my query is
could this be the Devonport PO's handstamp applied 'for fun' or is it a private handstamp applied
to the envelope before posting? I note that it is a real commercial cover so the second option
is less plausible than the first.

Does anyone have a 'definite' strike of a Devonport PAQUEBOT h/s of this type?