Every year the supplement Blocks Extra (1e) appears, which contains sheets of extra heavy paper (170 grs.) with plasticizer-free mounts.
Here you can store the stamps from blocks issued in the previous year.
On all sheets there are frames where you can put the stamps, usually with a picture of the stamp itself. On all these frames are transparent mounts to safely place your stamps in.
The Supplement Blocks Extra (1e) contains the year 2022.
The content consists of 4 pages; B226a,B226b,B231a,B234a.