Police want to speak to the man in relation to a robbery at Saturday Market jewellers, Beverley, at about 4am on Monday, November 6.
It is believed that three men were involved in the incident, which saw jewellery worth £25,000 stolen.
Following an eight day trial at Hull Crown Court last week, Ian Billany, 39, of Morpoth Street, Hull, was convicted of burglary and an armed robbery at a Newland Avenue bank on November 1.
Lee Rose, 38, also of Morpoth Street, admitted robbery and burglary in relation to the same incidents. Both will be sentenced at a later date.
Do you know this man? Call police on 101 quoting incident number 16/56744/18.