Quartered arms of Thomas Cromwell, 1st Earl of Essex, KG, stained glass, Bodleian Library OxfordAugmentation of honour of Thomas Cromwell, 1st Earl of Essex: Party per fess or and gules, a pale counterchanged all charged alternately with six fleurs de lys azure and pelicans with wings close vulning themselves of the first, 3 and 3. Granted by King Henry VIII in 1537 to Thomas Cromwell, 1st Earl of Essex on the occasion of the marriage of his son Gregory Cromwell, 1st Baron Cromwell to Elizabeth Seymour, sister of Queen Jane Seymour. Sources:

As seen in stained glass window of Bodleian Library, Oxford File:Coat of arms of Thomas Cromwell, 1st Earl of Essex, KG, stained glass, Bodleian Library Oxford.png;
As seen on Frontispiece of Great Bible of 1539, St John's College Bb.8.30, St John’s College, Cambridge File:Thomas Cromwell, 1st Earl of Essex, detail from Frontispiece, Great Bible of 1539, St John's College Bb.8.30St John’s College, Cambridge.png;
As seen on Parliamentary Roll of Arms of 1539/40, College of Arms, MS Num Sch 6/40, reproduced in  MacCulloch, Diarmaid, (2018), Thomas Cromwell: A Life, London: Allen Lane, ISBN 9780141967660, pp. 427–8, plate 8 (see also pp.38–9, note 81), all with tinctures.
Also seen on Portrait medal made for Thomas Cromwell in 1538 (without tinctures) File:Thomas Cromwell medal, 1538 side 2.png. All showing pelicans with wings close.
NB blazon given incorrectly in Merriman, R.B. (1902) The Life and letters of Thomas Cromwell, Vol. II, p.284 [1]; also incorrect in MacCulloch, D. (2018) Thomas Cromwell: a life,  p.679 (note 21): Per fess azure and or, a pale counter-changed, charged alternately with fleurs de lys of the second, and pelicans with wings elevated vulning themselves gules.
Own work, using File:PelicanVulningHerself.svg by Lobsterthermidor (talk) 18:00, 26 November 2022 (UTC)
Lobsterthermidor (talk) 18:00, 26 November 2022 (UTC)