1989 and 1990
Towards the end of its existance the FDGB seems to have stop issuing stamps or stocks were allowed to run down and contributions were marked in pen
Enlargement pages were stuck on the back cover of early books to give room for Solidaritätsmarken.
Enlargement Pages were often added to early membership cards to add extra years
Enlargement pages are rare in post 1961 books and usually single pages.
Book used for 16 years
This is an unusual example of a book used beyond its lifetime, designed for 6 years it has been used from 1956 to 1972