Is this William Spratling?

I have a large, brooch with the following mark that I cannot figure out. The only other marks on it are stamped Mexico and 925. All shown in this picture. The brooch is over 5 inches tall.
DSC08123.jpg

Hi there, I checked on www.925-1000.com and it’s definitely not William Spratling, which is a W that morphs into an S.
They unfortunately don’t show a mark like it, so you’re not much further ahead.

Thank you!