In Chanel jewelry, "06 A" generally signifies the collection number and design by Victoire de Castellane, who was the head designer for Chanel from 1986 to 1989, according to The Spruce Crafts. The "06" likely represents collection number 26, as The Spruce Crafts notes. The "A" could indicate a specific variation or sub-collection within that main number. These markings are commonly found on Chanel's oval tag or hidden on the back of the jewelry piece. EUC VINTAGE COLLECTION ✨️BIG Chanel CZ Crystal Enamel Striped CC Pendant Necklace Gold⚘️ ✨️BEEN CLEAN AND POLISHED BY JEWELER ⚘️ 🚨WITH COA AND FREE LUXURY VELVET BLUE BOX⚘️ CALLOUT: COUPLE STONE BEEN REPLACED BY JEWELER ,SAME STONE REPLACED CUBIC ZIRCONIA. ( NOT GLASS!) ✨️PLEASE LOOK ALL PICTURES, CNT TELL STONE BEEN REPLACED!⚘️ PRE LOVED ITEM, MAY HAVE SCRATCH PLEASE LOOK ALL PICTURES AND VIDEO ⚘️TY✨️ SOLD AS IS BID RESPONSIBLE NO CANCELATION THANK YOU ✨️ ❣️