[Verb] To go back to. If something dates back to a certain time, it was started then. Example: My father's haircut dates back to the 1960s.
Found on http://www.bbc.co.uk/skillswise/glossary/
A Date Back note is a Second Charter, Second Issue national bank note. Refers to the dates 1902-1908 found on the back.
Found on http://www.encyclo.co.uk/local/10143