Classes:

Sat to Tues Wed to Sat
2: Postal History 1: World Stamp Championship Class
5: Revenue 3: Traditional
6: Postal Stationery 4: Aerophilately
9: Open Philately 7: Thematic
11: Modern 8: Literature
12: Picture Postcards 13: Youth (part)
13: Youth (part)

 

10: One Frame are shown with their parent class