Could it be XY? The first letter is the month and should be one of: B L A C K P O W D E R X. Where B is January and X is December. If that is the date code then Y would be 1974. Or it could be that they added the month later on and YY would then be 1952. Do either of those dates make sense?
[This message has been edited by Mal H (edited June 20, 2000).]