The Armoury organ was bought in 1609 as part of a consignment of luxury goods from the Dutch merchant John Haan. Its maker is unknown, but it is currently thought to be English. It was set up by Thomas Dallam at Hatfield in 1611 when it received its lavish decoration by the artist Rowland Buckett for £26 13s 4d. It was substantially rebuilt by Robert Gray in 1738.
The central coat of arms is that of Robert Cecil, 1st Earl of Salisbury and his wife Elizabeth Brooke, the daughter of William Brooke, 10th Baron Cobham by his second wife, Frances Newton.
The left coat is that of their daughter, Lady Francis Cecil (1593–1644) and her husband Henry Clifford, 5th Earl of Cumberland.
The coat of arms on the far right is their son, William Cecil, 2nd Earl of Salisbury and his wife Lady Catherine Howard (daughter of the 1st Earl of Suffolk) whom he married in 1608.

