Marked, by permanent marker it appears, ".457" on the leather and the spout. Could be refinished or stained darker to hide that. Spout measures .604", so it could take up a .54 confidently, and may be suitable up to a .575 ball. Looks to be stitched with sinew, maybe artificial sinew. $30 shipped CONUS. PM if interested. PayPal or Venmo Friends and Family or check or money order accepted.
