The fourth stamp is a railway stamp...statsbaner is the Norway state owned railway. It's not listed in the Scott catalog nor is the last stamp which looks like a telegraph stamp. I would be intrested in more info on those two (not that I would expect them to have values over $5 or even 50cents, but they different and not in the catalog). The others at first glance look like pretty typical nordic postage stamps for the period...stamps 2 and 3 are from 1914 and portrait the Norway Constitutional Assembly of 1814 and have a Scott Catalog value of 50cents each.
People have been collecting stamps since the mid to late 1800's so unlike more modern collectibles (comics, baseball cards, etc.), 100 years old doesn't seem as old and doesn't guarantee high catalog prices. pre-1940 is a popular perior for collectors as it's the first 100 years of stamps and volume one in the popular Scott Internation Stamp album. I enjoy my collection of similar nordic region stamps.
You might find this closed
ebay auction of Swedish stamps interesting:
http://cgi.ebay.com/ws/eBayISAPI.dl...TRK:MEDWX:IT