PAN X81 from 1961 1st printing incorrectly numbered as X81 Cover Artist ?

PAN X80 from 1961 2nd printing corrected to X80 as in PAN catalogue Cover Artist ?

BBC1 - Mary Trewednack - Wild West - Episode 3 - The Swingers - 3/11/2002

AMC Channel - Don Draper - Mad Men - Season 1 - Episode 6 - Babylon - 23/8/2007

Also Issued by PAN Books as M32 and T32