Hiya Dave,
Welcome to the BBS. Firstly, you have posted this in the wrong section. You may get more success in the 'General Airgun Info & News' section.
Secondly, it is consider polite to fill the 'location' in on your profile.
With regards to your Meteor - if you post the serial number prefix (on the under side of the barel block in small letters/numbers) Im sure someone on here will be able to date it exactly.
Hope the help
Ian