AuroraSaab
Veteran
Thats good going
Another bike one that springs to mind is the original Cannondale Synapse Ultegra I paid £1850 new, got £1650 for it four years later ... maybe that was a time when dealers gave crazy discounts to shift stock? Dread to think what 2021 model costs
An even better one is my OH's whiskey collection. He had 4 or 5 unopened bottles of malt which had been in the wardrobe for 20 years or so. They were all £25 ones, not particularly rare. One was a Private Eye special edition of Macallen which was £36. They went for over £4k last year in an online whiskey auction.