“It’s a distinctive piece of art and we’re asking anyone in the public who has information on its whereabouts to get in touch.
“It may be that this artwork has been offered up or advertised for sale, and we need to hear from you.”
Police have urged the public to come forward if they have any information by calling 105 using the reference number 251208/4801.
Information can also be given anonymously via Crime Stoppers on 0800 555 111.