Big Bronze Knife

About 34s 0c on Beta · Horde (5 hours ago), 38s 0c on Beta · Horde (22 hours ago), and 39s 0c on Beta · Alliance (24 hours ago), from player scans. A vendor pays 14s 26c, so the auction house pays 2.3× 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 32s 30c there, against 14s 26c at a vendor.