A £25,000 reward has been offered for the return of the Wenlok Jug - if it is in a 'reasonable' condition.
Zurich, the company that insures the Stockwood Discovery Centre from where the jug was stolen, announced on Friday that it will pay the money as long as the recipient had no involvement in the theft.
The historical artefact, which was bought for £750,000 in 2006, was stolen from the museum on May 12.
Paul Redington from Zurich's Major Loss team says: "Zurich fully realises the importance of the Wenlok Jug both to the museum and to the people of Luton. We are therefore offering £25,000 for the return of the jug in a reasonable condition.
"Stockwood Discovery Centre is a place where people can freely view and enjoy such objects. We are dealing with criminals who have deprived the public of that experience.
"These cases are not just about writing a cheque. Ultimately, Zurich wants to assist the museum's efforts to get this jug back where it belongs, and so that it can be enjoyed by future generations."
Karen Perkins, Director of Museums for Luton Culture says:"We hope that this offer from our insurance company will accelerate the return of the Wenlok jug. We know that people in Luton care about it as a part of Luton's heritage."
If you have any information that can help with the investigation, call Bedfordshire Police on 101.
- EXCLUSIVE: First pictures as armed police arrest shooting suspect in Marsh Farm, Luton
- SLIDESHOW: Armed police continue to patrol Marsh Farm and Lewsey Farm
- Delaney Brown murder case: Kyle Beckford sentenced to life with a minimum term of 24 years
- Teen shooting: 19-year-old arrested on suspicion of attempted murder
- VIDEO: Delaney Brown's grandfather thanks 'brave' witnesses who gave evidence in murder trial
- VIDEO: Police release CCTV footage of man seen near scene of Thricknells Close shooting