Police are pressing ahead with their investigation into a stolen rare coffee machine, seeking the public's assistance to find it.

The machine, a customised 1961 Faema, was taken from a Glen Huntly catering business sometime between Christmas Day and January 5. The business was closed during that time.

Police someone who might have seen the machine, valued at $11,500, can assistant them with their investigation.

Anyone with information can contact Crime Stoppers on 1800 333 000 or visit www.crimestoppers.com.au.