A man was pinned to the ground and robbed of his Rolex watch as he walked through a park.
The 31-year-old man was walking through Hurst Grange Park in Penwortham, near Preston, when it happened at around 5.30pm on Sunday.
It is believed that the victim was pushed to the ground by two men who he had just passed sitting on a bench.
One man is thought to have held him to the ground and punched him whilst the other took a Rolex watch from his wrist. Both men then ran off down Valley Road.
The watch is a silver Rolex, Oyster Perpetual Datejust, featuring 10 diamonds, thought to be worth more than £6,500.
One of the men was mixed race, around 6ft 4 of a slim build with black hair and thought to be aged around 36.
He was wearing black and blue Adidas tracksuit and a blue jumper.
The other man was white, around 5ft 6 of a slim build with short brown hair.