It's definitely a 7 tail feather reverse of '79 as indicated by the slanted arrow feather. And it's definitely not what is sometimes called the B reverse because the B reverse had the straight arrow feather. See here for confirmation - B reverse - http://www.vamworld.com/Reverse+of+78-79 Reverse of '79 compared - http://www.vamworld.com/1879S+Rev+78
