Thanks for the feedback guys. After GSPfan's comment I've decided to put the scope up on eBay.
Edit: GunDoc7 - did manage to find the chart at the Leupold link below - Thanks. "7. When was my scope manufactured? Every Leupold scope produced since 1974 will have a letter included in the serial number acting as a date-code. Scopes using a letter as a prefix (the beginning of the serial number) were produced between 1974 and 1992. Scopes using a letter as a suffix (the end of the serial number) have been produced after 1992." http://www.leupold.com/resources/faqs/
