This is a Hot Roc single fin swallow tail. Built in Brookvale on Sydneys Northern Beaches by Micky Mac in the 70's.
The stringer, fin and logos were masked off. The rails up to the original pinlines were also masked. Then auto acrylic paint was applied.
This board is a "Hayden" built in the late 60's. Built at Hayden Kenny Surfboards, on the Sunshine Coast in Queensland, Australia. It is 8' 4" in length by 23" wide. The wide point is 4' 3.5" from the tail. The nose is 18" and the tail is 15.5" and it is 3" thick. It has a production number behind the fin 2990. The bottom is cambered. It has a Greenough stage 3 fin.
The board was in a pretty poor state of repair.
These two photos show the bottom freshly glossed. The brighter yellow pigment coat was added to cover some restoration work. New pinlines were added. The rails were pigmented to the cut lines. The red inside the cut lines on the bottom and the darker yellow on the deck are original colour work. Painted onto the blank.