Read the history of Berkley Models
I actually remember Berkley Models. They were still available at toy and candy stores and discount shops in the neighborhood like J.J. Newberry's, John's Bargain Store, Cheap Charlie's, George's Variety Store, Ted's Stationery, Jam's Stationery and Eddie's Junk Shop into the mid-late '60s. I had the Firebird, and let me tell you, it burned rubber using those CO2 cartridges. Disintegrated when it hit a curb; but, cool while it lasted.