Frequency is measured in hertz (Hz). A person who has hearing within the normal range can hear sounds that have frequencies between 20 and 20,000 Hz. The most important sounds we hear every day are in the 250 to 6,000 Hz range.
An issue date was added, and cheques may not be valid a certain amount of time after issue. In the US and Canada a cheque is typically valid for six months after the date of issue, after which it is a stale-dated cheque, but this depends on where the cheque is drawn; in Australia this is typically fifteen months.
The check was 16 months old, which is what is known as a stale dated check. As I have been told, checks older than 90 days are never supposed to be cashed or credited. When I spoke with the bank manager at Sovereign Bank, he said he was really shocked, that cashing a 16 month old check was, as far as he knew, illegal. The check had originally had a stop payment placed on it.