They date from the 1970s and ’80s.
5. Scientists in the Heinz laboratories in 1978
. Photo: SUBMITTED
6. Uncle Joe's Mint Ball factory staff with some of the finished products in 1971
. Photo: sub
7. A Heinz open day at the Kitt Green factory to celebrate the company's centenary in 1986
. Photo: Gary Brunskill
8. Another batch of Mint Balls ready for the shops
. Photo: sub