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Similar differences are apparent on the insert (Below) The first insert uses the rounded 9 and has a comma after Canada.
The second has the Squarer 9 and uses a full stop (Period) The length of the stamping is also different, this is most apparent when comparing lines 1 & 2 There is some discussion regarding the date of the removal of the 1950 stamp - see here for details In 1967 both the base stamp and the insert changed.
From 1959-1963 additional text was added "FOR BEST RESULTS USE ZIPPO FLINTS AND FLUID" This was also on 3 lines higher up the insert.
From 1963 to 1967 the imprint on the insert was changed changed from the horizontal (upright) to the vertical The flint wheel rivet can also be used to help date the lighter.
(see photograph at bottom of page) these were used until around 1957/8.
Up until 1959 the insert had just 3 lines of text at the bottom.
Dating lighters made at the Canadian factory is a little more difficult, and often confusing, but with a little detective work, many of the clues are there.This was replaced by the narrow cam spring which was used until around 1970.The "widespread" spring first appeared around 1970 and continued in use until the factory closed.The lighters were stamped "Patented 1950" and many people think that this is the year of manufacture of the lighter.This stamp was used until 1967 and a lighter with this stamp could have been made anywhere between those dates.