[ Castlereagh; HRH The Duke of York, Field-Marshall, C in C ] Valediction of Autograph Letter only, signed "Castlereagh"

Castlereagh [Robert Stewart, 2nd Marquess of Londonderry (1769 – 1822), usually known as Lord Castlereagh]
Publication details: 
Docketed '2 September 1807'
SKU: 22645

Clipped signature/valediction, 18 x 3.5cms, good condition. Text: "very favorable. | I have the honor to be | your R. Highness | most faithful | & obedient Serv[ant] | Castlereagh", parallel to "H.R.H. | The Com[mande]r in Chief". Castlereagh was Secretary of State for War in 1807.