Night Watch Shortsword

About 1g 29s on Beta · Horde (5 hours ago), 1g 49s on Beta · Horde (22 hours ago), and 1g 25s on Beta · Alliance (24 hours ago), from player scans. A vendor pays 17s 42c, so the auction house pays 7× 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 1g 22s there, against 17s 42c at a vendor.