Traditional shaped bottles containing Old Spice for Men toiletries (after shave, cologne and talc) had very similar stoppers since the first bottles in 1938.  They evolved a bit over the years and can be helpful in dating a bottle.  I identify here six different stopper styles.

The technical name for that little stopper pin is a "pintle."

Stopper #1 - 1938 to Early 1950s

old spice bottle stoppersold spice bottle stoppers
Stopper #1 appears on the original pottery bottles, and on the earliest glass bottles starting in 1946.   The bottle is capped with a tin shroud on a cork which is pressed into the bottle and sealed around the neck.  The pintle is tin with a top disc nearly 5/8 inches in diameter. The top disc comes to a small point in the middle.  Note the wide collar at the top of the stem (left photo).  This wider collar has a recess into which the small rim on the bottle top fits to secure a seal.
 

Stopper #2 - Early 1950s to 1956

old spice bottle stoppersold spice bottle stoppers

Stopper #2 appears on the glass bottles in the early 1950s.  It is similar in shape to Stopper #1 but is only 1/2 inch in diameter. The tin shroud is attached to a polyethylene stopper that proved more effective in sealing and resisting the effects of alcohol. The pintle is a pinkish polypropylene and still has the little bump on the top. 


 

Stopper #3 - 1956 to 1970

old spice bottle stoppersold spice bottle stoppers

Stopper #3 shows up in the mid 1950s and is gray polypropylene. The top is eight-sided, measuring 19/32 inches across the flat sides and 1/8 inch thick. The pintle has a round disc on the top with no discernible bump.  By the 1950s the shroud around the bottle top is aluminum.  When viewed from the side, there is a slight curve from the stem to the top.
 

Stopper #4 - 1970 to 1993 (present day)

old spice bottle stoppersold spice bottle stoppers
Stopper #4 differs from Stopper #3 in several aspects. There is a star molded into the top disc of the pintle. The top of the stopper is thicker at 3/16 inch. When viewed from the side, the stopper is a "T" shape with no curved shoulder.

Stopper #5 - 1967 to 1970

old spice bottle stoppersold spice bottle stoppers

Stopper #5 is identical to Stopper #3 but in white rather than gray polypropylene.  The white stoppers were introduced on the new "alternative fragrances" introduced in the late 1960s: Lime and Burley.

Stopper #6 - 1970 to 1993 (present day)

old spice bottle stoppersold spice bottle stoppers

Mirroring the evolution from Stopper #3 to Stopper #4, Stopper #6 is similar to Stopper #5, but white with a thicker top and square shoulders.  It continued to be used on Lime, Burley and Leather traditional bottles.