each signed, dated and inscribed 'AP IX/X' in pencil, one of ten artist's proof sets aside from the numbered edition of 50, 'Study I' and 'Prince Consort' additionally titled in pencil, further numbered in pencil on the justification page, published by The Royal College of Art, London, the sheets loose (as issued), within the original burgundy cloth-covered portfolio with the title, date and RCA logo embossed on the cover