Nottinghamshire investigators have released a CCTV image and are appealing to anyone who recognises the man to come forward.
It comes after thieves broke in through an upstairs window at a shop at the Handley Arcade, Toothill Lane, in the early hours of April 22.
Around £300 worth of goods including a gold ring, two silver rings, money from a cash register and the rare coins.
Police Constable Ryan Frew-McGill, said: "The force was called to Handley Arcade on Toothill Lane in Mansfield following a report of a shop theft at around 2.10am, on April 22, 2021.
"It appears that the offenders gained entry through an upstairs window. Theft is totally unacceptable and we will always take action against offenders. Incidents like these not only harm businesses financially, but they can also be incredibly distressing for staff within the stores.
"We have now issued a CCTV image of a man we would like to speak to in connection with the incident. If you recognise him or if you saw anything suspicious in the area please come forward.
“We are aware that incidents like these can have an impact on local businesses and the community. We have increased patrols in the areas to provide reassurance to them and will be engaging with them to offer crime prevention advice.
"If you saw anything suspicious overnight on the evening of 21 April please call 101, quoting incident number 164 of 22 April 2021."