Help reading Irish Silver marks

British Silver Reading Silver Hallmarks
1

Hi all,

I’m stumped with this one so would appreciate any help! This is a pretty stunning looking cake slicer with a nice king neptune theme.

I believe it to be Irish silver, however the Harp does not have a crown (cannot find any info about this). There is a duty mark however i am unable to identify this either, or find any info about a maker ‘CK’. I’m probably barking up the wrong tree though so hoping someone might know these marks, cheers.
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2

This looks all wrong for an Irish hallmark. As you point out, the harp should be crowned. The Hibernia, “duty mark” and date letter all look very crude so I think it is a pseudo-mark of some kind, but it’s not one I’ve come across before.

3

Thanks very much, its an odd one.