Karrimat (closed cell sleeping mat),1984, still sometimes used. Cut down to torso size as one end suffered some heavy damage. Only weighs 200g!
Karrimor Jaguar 65 litre rucksack from the mid 1980's. still my rucksack of choice for wild camping. Have had to repair the plastic mounts for the internal frame bars, but the fabric is absolutely sound.
Wild Country Trisar tent from late 1980's. Walked the length of Wales, several wild camps with my wife to be (Pyrenees, Highlands) and a lot of more casual use. More recently used for a wild camp at the head of Hayeswater with my youngest son last year. Seams have had to be repaired, and the poles are not as strong as modern equivalents (have had to replace one), but still in use.
Robert Saunders Jetpacker tent - I inherited this. Lovely design for its day, and in almost mint condition, but like sleeping in a coffin, so this one stays in the cupboard. Perhaps one of my sons will use it.
Buffalo fibre pile sleeping bag, 1984, used in the Alps and Pyrenees back in the 80's, and on my more recent summer wild camps. Seems to be indestructible.