Here is a French Levant issue with what certainly appears to be a perfin. It is upside down to assist in looking at the perfin, with a blue background to help it "pop" a bit.
It seems to be a C and (maybe) an L, separated by some distance. I've included a detail of the C.
Is this something other than what you'd traditionally define as a perfin? I'm only skeptical because I've never run across a French Levant perfin before.
Thanks for looking.


[edit: By the way, does anyone agree that this postmark is Constantinople-Galata?]
[second edit: I found an auction result for a German Levant cover that included this particular perfin as a Credit Lyonnais perfin (on a CL envelope, so seemingly pretty reliable as a source). The other Credit Lyonnais perfins that I had seen were overlapping, along the lines of a monogram, so I had ruled that out.]