You probably would have heard of the expression "one swallow does not a summer make". Curiously, it seem that this was an expression by the Greek philosopher Aristotle(384 BC-322 BC). The original was "One swallow does not a summer make, nor one fine day; similarly one day or brief time of happiness does not make a person entirely happy". Nowadays, it usually means "A single instance of something is just that; it doesn't make a trend."
However, there are 4 good examples to prove that this interesting error is not a one off. It is either from a damaged surcharge device or the numeral 8 was put in error instead of a S. In order to know whether this was a fixed error I need to examine a whole sheet or at least a large part sheet but has not had the opportunity to be able to do so.
These examples are less convincing but the 5c stamp is quite close.
