Every year the supplement Luxembourg appears, which contains sheets of extra heavy paper (170 grs.) with plasticizer-free mounts.
Here you can store the stamps 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 Luxembourg contains the year 2021.
The content consists of 4 pages; 190,191,192,193.