Copper Chain Vest

About 8s 0c on Beta · Alliance (6 minutes ago), 12s 0c on Beta · Horde (6 hours ago), and 10s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 1s 42c, so the auction house pays 5.4× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it on the auction house. After the 5% cut a stack of 1 brings about 7s 60c there, against 1s 42c at a vendor.