The arms are those of Warren of Ireland impaling (unknown).
See D.S.Howard, op.cit., p.278, and in colour p.122. Cf. also D.Howard and J.Ayers, op.cit., p.418, pl.417 where the author suggests that the unknown coat may only have naval significance. The whole arms are identical to those engraved on a print of 1747 depicting HMS Invincible with the dedication: 'To the Right Hon. Sir Peter Warren, Knight of the Bath, Vice Admiral of the Red Squadron of His Majesty's Fleet etc., this plate is most humbly dedicated being an exact view of His Majesty's Ship Invincible of 74 guns, one of the six French men of war taken on the 3rd March 1747 by the British Fleet in which he commanded as Rear Admiral of the White.'
The vine decoration on this service is the only known example in underglaze-blue.