Notes: Undated 6th printing of the 2010 edition, by numberline. Title page:

• Gollancz colophon.

Copyright page:

• "Copyright © Samuel R. Delany 1967"
• "Introduction Copyright © Adam Roberts 2009"
• "First published in Great Britain in 1999 by [over] Millennium [over] An imprint of Orion Books Ltd"
• "This edition published in Great Britain in 2010 by [over] Gollancz [over] An imprint of the Orion Publishing Group [over] Orion House, 5 Upper St Martin's Lane, [over] London WC2H 9EA"
• "An Hachette UK company"
• Numberline: "7 9 10 8 6"
• "ISBN 978 0 575 09420 8"
• "Printed in Great Britain by Clays Ltd, Elcograf S.p.A."

Back cover:

• "Based on illustration by Chris Moore/ Artist Partners" (no visible signature on the artwork)
• "UK £9.99" (no additional pricing)

Spine:

• SF Masterworks, Babel-17 in black; Samuel R. Delany in light blue (not green), all on graduated yellow-to-white ground.

Printing error: the word "MASTERWORKS" does not appear on the front cover. Introduction is signed, page xi, "Adam Roberts". Novel starts on unnumbered page 1. Novel is signed, page 192, "— New York. [over] Dec '64—Sept '65". Semi-gloss cover.