I had a recent enquiry from a fellow PAN Fan Jem who asked about PAN Pipers specifically MP67 “Australia:Her Story” (MP because it cost 5/-) and XP67 “Enemy Of Rome” (XP because it cost 3/6) and who wondered why PAN had used the same number for both titles?
This is a mistake on PANs part in that XP67 should really be XP70.
If XP67 had been incorrectly labelled as ??47 (anyone know what it is?) then it might be a more understandable mistake.