Le Blog de Callisto: Identifier et dater une ancienne machine à coudre Singer ^^
Vintage Sewing Machine Serial Number Location Help | Collectors Weekly
Find sewing machine model number from serial number / FAQs
About to buy this beauty! Anyone have an approximate date? The serial number starts with C (meaning there are no records on the database) : r/SewingMachinePorn
Singer Sewing Machine Company Serial Numbers
Serial Number Revealed: How Old Is My Singer Sewing Machine? - Contrado Blog