We as collectors have a great interest in cancels...it is exciting finding the ERD (Earliest Recorded Date)...Then next best is LRD (latest Recorded Date)...Collectors, dig deep, pay attention to cancels..You may have a good find sitting in a stock book.
Here is an example of a possible LRD
Canada Scott 98 - released JUL 16, 1908
Here is a good find, my same stamp with a LRD of MAY 10, 1943
Used approx. 12724 days
after being released.
Cool find..Every one keep looking ad have fun.