This the Singer Featherweight Book that many people request and enjoy. It is titled The Perfect Portable and Its Stitches Across History by Nancy Johnson-Srebro.
This is a 220-page book compiled of information surrounding the Singer Featherweight Sewing Machine. You will find history*, various Featherweight styles, colors, badges, parts, accessories, serial numbers, changes over the years, tables, troubleshooting, and so much more! A large-print Featherweight 221 Instruction Manual has been reprinted for inclusion as well.
This is the 3rd and updated publication.
* Please know that much of the historical data included in this book is based on conjecture and surrounding mystery, but some still find this information fun to peruse and take note of.