Please help identify my departed mom’s pendant


I have this abalone sterling pendant with a bird flying over the ocean and a sunrise. I know it’s probably not worth anything but it was in jewelry that belonged to my mom who passed away in 2013 and I have been trying for years to find out what the marks on the back mean. I can’t thank you enough for any help. I will try to upload a picture but it looks like a crescent moon turned in the shape of a U with a round dot above it and all encircled the word Sterling below it.