The German Scout stamp group, ArGe Pfadfinder, has produced and used the Scout slogan meter catalog ArGe Pfadfinder Freistempel Katalog since at least the 1990s. This has become the primary reference for identification of Scout slogan meter stamps.
ArGe Pfadfinder and SOSSI have collaborated to release the first digital update to this informative catalog. In the 2021 update there are 36 countries in 274 pages, bookmarked in both German and English. The pdf is searchable to aid in finding a slogan. Enhancements to the original include color examples (where possible), identification of the meter stamp type and known years of usage.
The International Postage Meter Stamp Catalog by Richard Stambaugh was used to identify the meter stamp types. The ArGe-SOSSI Scout and Guide Meter Stamp Catalog 2021 Update, compiled by Charles Schafstall from the preceding catalogs and original research, is available to members and non-members at no cost. You can download by clicking on the cover image. Additions, corrections or comments can be sent to Charles Schafstall. Yearly updates are planned.