I was gonna say F15. Nice one, 'Swimmer. Good n' crusty. Has some really handsome CircCam contrast. I like it- a lot! It is also a Philly, which is about 30x scarcer than the 1875-S. So is my recent purchase, which arrived yesterday: And speaking of 1875 Philly mint double-dimes, this one was my previous type coin. Same date, mint, grade, and service as yours. And also a CircCam.