Additional notes: An illustrated card envelope in a transparent plastic envelope. Opening 6 October, until 30 October 1987.
See page 120 of "Some Forms of Availability", Granary Books, 2007 where this item is illustrated under "Some Coracle Ephemera" as item 33: "Do you think this is an invite or booklet?" - I think this is an invitation with a built-in booklet, which went out in a transparent envelope with the mailing label stuck on.