Destinova94, Don's information is bang on for gathering info on those stamps. I wish my grandparents had saved their buisness mail and stamps from the turn of the century so that I may have inherited
it. Looks like the previous owner enjoyed the hobby of collecting by taking the time to mount in an album. As far as potential, don't focus only on the dollar value as most do first. Take the time to acquaint yourself as it can likely be a valuable lifelong relaxing hobby; to be enjoyed in learning and education potential.Enjoy!