Very old Danish stamp album

My brother acquired an old Danish stamp album several years ago and is now
wondering what it could potentially be worth. The album is a blue hardcover
book with silver lettering and borders. The title is "Frimaerke Album" with
a drawing of a french horn below. It was published by N. Hansen and Co.s
Forlag. There is no date. It has 62 pages for stamps from many different
countries. Each page has stamp pictures and years. The actual stamps he
has in the album are mounted on hinged paper tabs. About 20% of the stamps
pictured in the album are in the collection.

The stamps he has range in years from 1852 to 1904, with the majority of
them from the 1860s and 1870s. They are from all over the world, mostly
Europe, with some South American, Cuban, and Puerto Rican stamps. Some are
unused. We don't have access to a Scotts catalog. Any information on
albums like this and how to determine a value?