Derbyshire police are investigating after robbers cut a man's neck and hit him with a hammer.
At around 10.15pm on Saturday, two men entered a house on Sunningdale Avenue in Marlpool.
A Derbyshire Constabulary spokesperson said: "They took the owner's watch and demanded cash.
"They threatened the man and cut his neck and struck him with a hammer.
"One of the men was wearing a balaclava."
Anyone with information should call DC James Wall on 101, quoting reference number 18000216964.