So I needed a frame for a picture I have, saw the perfect one in a charity shop, didn't pay much attention to the picture in the frame, just liked the frame. Bought for princely sum of £1.99.
Get home, take picture out to replace with mine and notice the picture in the frame I bought is an original watercolour by a little known South American artist called Lopez Baylon. Look him up on the internet and find that there are oil paintings on canvas (this is watercolour on card/paper) by same artist going for between £350 - £1000 on Ebay.
Take back to charity shop or sell on Ebay?