Any idea what this cancel is?

It brings to mind a Maltese cancel that was used as a paquebot or ship mail cancel, with a Maltese cross inside a circle. My mind is not filling in the missing lines...
Thanks for any ideas. A picture of the Valletta paquebot cancel that I'm referring to would be great, too, if you can decipher my description.
C.
[edit: This is the scan I was thinking of...not mine, and I can't remember where I picked it up...I had saved it under Valletta instead of Malta. Having it in front of me lets me fill in the lines that weren't making sense in the KGV stamp, above. I think they are the same, or at least very similar. ]
