Police in Haringey are appealing for witnesses or information concerning the burglary of a military supplier in N15 on Monday, 18 August at 5:50pm.
An assorted of nine ceremonial garments and two silver Household Cavalry helmets were stolen.
The combined value of these items is in excess of £60,000.
Officers are keen to hear from anyone who is offered these items for sale or who has information concerning the theft.
Anyone with any information is asked to contact Haringey Police Burglary Unit on 101 or call Crimestoppers anonymously on 0800 555 111.