Two bronze figurines were stolen from a York art gallery between 12pm on Saturday 7 April and 10am on Thursday 12 April 2012, while the gallery was open to the public.
The figurines of a man and a woman are made of solid bronze and stand 15 to 20cm in height. The pair is valued at £1,360.
PC Nicola Manning, of York Safer Neighbourhood Team, said:
I urge anyone who may have information about the theft or knows where the figurines are now, to contact the police or Crimestoppers straight away.
Or call Crimestoppers anonymously on 0800 555 111 quoting reference number 12120058209.