nice example DEVLEC..those die cracks occur on about every silver dollar year after 1949 that I can think of up until about 1957. it isn't really a marker for the arnprior as they were just a common place for the cracks, whether it's a 1950, 51, 52, 53 etc. your coin looks like a short water lines at rear of the canoe example, this can also be found on many years and doesn't mean a coin is SWL, Arn or anything as it can be found on FWL, SWL and Arn coins since it is simply die polishing and many dies were used.
Feel free to call me Will.




























