The old florin before 1938 I think had a significantly higher value because of its silver content. Back in the 60's there was quite a market in selling them to certain people who would melt them down and reclaim the silver. All strictly illegal of course. Defacing a coin of the realm etc.

Also 5 shillings was called a dollar as at the time there were 4 Dollars to the pound. My Dad and Uncles always referred to it as that so naturally I did as well.