Broxtowe thieves threatened and cut a 19-year-old with a knife before stealing his smartwatch.
Three men knocked the victim to the ground in Aspley, stole cash and a slate grey Pebble Smartwatch, before running off in the direction of Beechdale Road.
The victim was taken to hospital but is recovering well.
The crime took place around 6pm on Monday, January 18 in King George Park.
In what is thought to be a related incident two 13-year-olds were threatened by three men and robbed of their mobile phones on the same night, at the back of Harvey Hadden sport field.
Police are looking for the robbers, who are described as black, thought to be in their late teens and local to the area. Two of them were wearing bandanas.
Detective Inspector Nick Waldram said: “These were very public robberies in large open spaces. Perhaps you saw something or know of men who meet the description – particularly the bandanas. Perhaps you’ve been approached to buy the stolen items or know someone who has suddenly acquired them?
“These incidents, although linked, do appear to be isolated but I want to make it clear that we will not tolerate knife crime in our communities. The victims have all been left extremely shaken by the ordeal. We are appealing to anyone with information that could help our investigation.”
Anyone with any information is asked to call Police on 101 referencing incident 623 of January 18.