One year after my studies, in 1988, I bought a friend's Fender's bass and guitar for the equivalent of 620 Euros (around 530 GBP).
I only wanted the bass, but as he was getting married, he needed the money and was willing to sell both the bass and the guitar.
I bought both for the 25.000 Belgian Francs he wanted.
I then just checked the guitar which turned to be an L series early 1965 Fender Stratocaster (badly) painted in white ... with a brush as my friend was sick of its Fiesta Red.
I sold it quite instantly to my friend Christophe Leduc (yes the French luthier) for the same amount, 620 Euros, he totally restored it and still have it today and you know its value which is around 20 times the price he bought it.
The bass was a 1971 Precision Bass that I kept for a year or two, and sold for 30.000 Belgian Francs, so basically 30.000 times the price I paid as I eventually got it for free in the deal.