Vintage soda pop is a term used to describe a type of soft drink that was popular in the early 20th century. The most well-known vintage soda pop is NEHI, which stands for the National Ex-Prisoners of War Helpers Incorporated. NEHI was first produced in 1924 and quickly became a popular beverage. It was known for its unique flavor and was available in a variety of flavors, including grape, orange, and peach.