Every year appaers the supplement Monaco, this contains the sheets for the Leuchtturm preprint album.The sheets have SF mounts and an 13 ring perforation for the Leuchtturm ring binders.
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 Monaco contains the year 2023