Hello, The spine markings on Attache SL carabiners changed in 2006. To know the product’s manufacturing year, you need to read the individual number marked on each product as follow: 09365AB1234 09: correspond to the year 365: correspond to the day AB: correspond to the person that checked and controlled the product 1234: is the serial number of the product In the past, some of the product were not graved with an individual number and were marked this way: 99289A :Year of manufacturing 1999 Day 289 A correspond to the person that checked You will also find some more information on the Petzl web site where you can download all technical notices. All the best