Carrott, I did that too. There were two values, Prince Charles on one and Princess Anne, aged about 2, on the lower value. I think it was to instil the idea of savings in us at an early age! We has 3 collection days - Weds was school fund (charitable stuff), Thurs was savings, Fri was library fund. If you were lucky you could be monitor for one of these which meant you missed assembly because you were totting up. I still have a few of these old saving stamps (2 or 3 I think) in my ancient memories box!