I was thinking the same as Gay - Art Deco, maybe 20's or 30's. When I searched for "Art Deco fan quilt" most of my results were more complex than this block. I also got several Dresden variations. I think Nancy Zieman had the most similar block:
http://www.nancyzieman.com/blog/quil...f-the-month-6/
That is a nice block. Thanks for sharing.