Police Scotland is urging business owners to exercise caution when accepting high value bank notes.
The warning comes following several reports of counterfeit money being provided in exchange for goods and services in a number of Aberdeenshire areas.
Police recommended that checks should be made of notes prior to acceptance with particular attention paid when checking watermarks and serial numbers.
Sgt Rod Smith said: “We are warning shopkeepers to be on the look out for these notes, which we believe are English £50 notes.”
Police have asked that any suspicious activity or relevant information is reported by calling 101 or via Crimestoppers on 0800 555 111.