These rare limited edition mugs are much sought after items. Only 4 are still believed to be in existence and all purchases of the mug come with an owners certificate to ensure authenticity.
It’s important to note that the genuine items have a double exclamation mark and are capable of purifying any water placed with the receptacle (unfortunately the technology was stolen from Team Oarsome before they could deliver it to its final charitable destinations, but work continues to replicate the research).