Hi Alexander.
This P.M. Cunningham, a lieutenant of the Royal Navy Reserve, might have been a doctor with a determined speciality.
The symbol on the left of the emblem is no doubt that one of medicine.
The other two symbols could be relative to things like the said speciality, the place he was praticing or the college where he made his degree; not to the ship's name. After all, he was in the reserve.
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