Beautiful Cado! And yes, the Seville was introduced in 1967, Avocado Green is FOR SURE available in 1968. Unconfirmed in 1967. Which would account for the rarity of pre PATENT standard Cado kettles with thumbscrews. The Seville and Sequoia lid vents followed the same pattern as the standard kettles of the day (pre pat, PAT PENDING, PAT # and so on...) Love this grill!