This was a very cool toy. It was sharp enough to cut you. Later versions made it safer to use, but not as effective to create designs.
This is a very, very old Marlboro cigarettes advertisement.
Now, this is terrifying! A bottle of Bayer's 'Heroin'. Between 1890 and 1910 heroin was sold as a non-addictive substitute for morphine... It was also used to treat children suffering with a strong cough.