1920's Singer 66: Renovate or upgrade to Singer 201-2? : r/vintagesewing
Clara's Cleanup Part One - Refinishing a 1924 Singer 66 – Broiderie Stitch
They don't make them like they used to — Helen Poremba
Restoration of a 1925 Vintage Singer Model 66 “Red Eye” Sewing Machine – Professionally Restored Vintage Fine Quality Sewing Machines
The Vintage Singer Sewing Machine Blog: A Visual Guide to Identifying Singers from Crappy Craigslist Photos, Part 4: Ruling Out the 27/127, Ruling In the Model 66
SINGER 66, SINGER 99, SINGER RED EYE, SEWALOT
Singer 66 or 99 - how to tell the difference - YouTube