Officers are investigating the robbery of a shop in Eastwood in which a thief ran off with a cash tray.
It happened at a ship in The Hollies at around 7.35pm on Wednesday, August 9.
A man threatened staff whilst demanding money, then took off with the cash tray before fleeing down Wellington Street.
The second happened at around 3.15pm on Sunday 27 August in Pastures Road, Stapleford.
The man in the photo is described as white, in his 30s, of a proportionate build and was wearing a blue beanie hat, a grey jacket, dark bottoms and black and white trainers.
If you recognise him or have any information that could help, call 101 quoting incident 795 of 9 August.