Police are looking for the men in these photographs in connection with reported fake notes used in the Boston area.
One of the men is believed to have paid for goods at the bar at the Supreme Inns in Donnington Road, Bicker, on November 2, with a fake £50 note. He received change.
On the same day, a second man is believed to have attempted to do the same but a staff member, who believed the note was a fake, refused to take the money.
An attempt to use a £50 note was then made by a third man who became argumentative when staff refused to take the notes.
The first man has been described as was wearing a cap, glasses and a dark jacket.
The second man had his hair shaved on the sides and was wearing a long top and jeans and was in his 20s.
The third man has been described as having an Irish accent and was wearing bright blue shorts and a dark top.
Lincolnshire Police are asking anyone with information to call 101.