yes very old and boring ,but...
When i lived in germany we found an old book in an atick.
Anyhow last week we had a clear out and were about to throw the book out but we had a look and found some of the stamps are quite old.
We did a bit of googleing and one of the stampe we have is up for auction FOR 7000 euros.Others 150 and so on
This book has at least 100 stamps in it dating from late 1870 onwards
No idea where to get it looked at or priced