Vintage Mail Order patterns are not from one specific company - they were syndicated through numerous publications and often come with the original mailing envelope for that added bit of historical ephemera. WeSewRetro has a bit of a soft spot for them and if you want to get all nerdy about it, you should read this.
Mail Order Patterns
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1960s Vintage Sewing Pattern: Dropped Waist Dress. Grit 8277 Mail Order Pattern
Paper Patterns
$18.00