Officers investigating the armed robbery at Guest and Philips Jewellers in Beverley have recovered two stolen watches.
The raid happened yesterday in Saturday Market and robbers escaped with watches worth thousands of pounds.
A silver Vauxhall Omega, which was used as a getaway car and recovered from York Road, had previously been seen in Hereford Street in Hull in the days prior to the robbery.
Police are keen to hear from anyone who has seen the vehicle between 28 July until 6 of August 2013.
Two watches have also been recovered from the car - a Cartier and a Gucci watch, which are believed to have been stolen in the armed robbery.
Detectives are extremely keen to map the movements of the Silver Vauxhall Omega car between Sunday 28 July and Tuesday 6 August 2013 in the Hereford Street and Gypsyville area of Hull.
Anyone who saw this car in West Hull or the East Riding is urged to contact Humberside Police on 101, quoting log number 137 of 06/08/2013.
Pictures of the car appear in earlier stories on this website