Looks to me like a snail trail block with fancy schmancy sashing & corner stones. The cornerstones are square in a square in a square. The sashing looks like a tri recs, but it's not. It's elongated, I'm thinking this needs to be paper pieced. The sashing is 1/3 the size of the block, so if you make a 12 inch snail, make 4" sashing and if you make a 9 inch snail, make a 3" sashing
[ATTACH=CONFIG]473906[/ATTACH]