The description below is taken from the Airfix catalogue this kit was first seen in. There is also extra information underneath the main catalogues description including the changes to the name of this kit in the catalogues.
Airfix Catalogue description:Brontosaurus was one of the largest and best known of the dinosaurs, and this new addition to the Prehistoric Monster range illustrates well the incredible length of the creature. The kit has 16 parts which makes it easy to assemble, and complements the other items in the range. The finished model measures 357mm in length. - Taken from the 1981 edition catalogue
Airfix Series (first appearance): 4 Rarity of early version: Scarce
This kit appeared in these catalogues:
1981 Edition Ref: 04800-4 1982 Edition Ref: 04800-4 1983 Edition Ref: 9 04800 1984 Edition Ref: 9 04800
Just some of the kits listed...