I didn't forget the ICFC; it wasn't a major trophy as it wasn't recognised by UEFA.
From Wiki "The competition was initially only open to teams from cities that hosted trade fairs and where these teams finished in their national league had no relevance. Early competitions also featured a one city, one team rule. After 1964, it was sometimes referred to as the Runners-up Cup, with teams now qualifying based on league position."
So it was more recognisably based on ability when Newcastle won it but still wasn't official.