Need help identifying a sterling maker's mark

[dewdropvintage]

Hello,

I have come across a  maker's mark I am not familiar with on a pair of sterling, marcasite and black onyx earrings. I have searched all the sources I know of     and have not been able to identify it.  Does anyone have any information about it?  I appreciate any help you can provide.  Thanks!

[kc1ict]

heirloom 73