Canada issued this stamp in 1966 to
promote Highway Safety.
About the stamp Unitrade catalogue notes:This stamp was issued with Davac gum, clear and tasteless.
This was a vast improvement over the dextrine gum which
as I recall tasted like crap.
Specially after licking a hundred stamps for Christmas mail.
It reminds me of that Seinfeld episode where George's
fiance dies after licking envelopes of wedding initations.
Come to think of it, nowadays almost anything reminds me about
something of the past.
I believe Davac gum was used only for one more Canadian issue
and by the late sixties all gum was PVA.