I've come across some tyres that whilst a bit dirty, I don't believe have had any use on them and look in great condition. However, I can't identify the age of them, there doesn't seem to be an obvious DOT code with the appropriate numbers.

Unless the 149 stands for 14th week of 1999 or 1989 etc?
They are Michelin Classic Radial X tyres I believe if that helps?
Cheers,
James