production information

[old_blew_72]

i've just returned from a good guys car show and was facinated with how much people know about the build options of their vehical. one guy knew the month and day his car was built! is there any better way of knowing that type of thing about for instance my c20 other than what number it was off of the line? like... you couldn't get this option after this date in this year??? that type of thing.... or do you have to basically decode the production manual? thanks to anyone that may have more knowledge than me!