3 pounds off paper Worldwide
The Postal History Foundation has a lot of mixtures available. They always have off paper world mixes for about $40 per pound, and the volunteer asked me if I wanted larger stamps or smaller ones. At one glance, I knew I wanted the smaller ones. Instead of pretty topicals, the smaller mix had older stamps, and way more of them per pound, not to mention how many postmarks I expect to find. I had a few nights to fiddle with them in hotel rooms, and picked some countries or groupings that had good quantities, like early Belgium, early Poland, pre-war Japan, Germany AMG, Germany Reichspost, and postmarks, of course. I soon had enough Belgium that I could split out some specialty batches: railways, precancels, early issues with tabs, even a few of the "-10%" variants. Here's a shot of the mixes back at home. I started sorting them by first letter, with a quart baggie for each letter (although some letters like D-E and K-L never have huge amounts, so they can go together) .