fUPDATE! I have found 5 different styles of advertisement for the Tyfold to be found in American newspapers in 1903, pretty well blanketing most of the USA. I’m finding Newspapers.com to be the best way to research a date for a debut of a major brand’s collar. This is especially true for a “gadget” type collar that uses a new patented feature. Click on each thumbnail to see more:
The Tyfold’s patented keyhole front feature was apparently not printed on the collar, because the Cluett Co. did not own the patent outright. According to Google Patents it was invented by Edwin F. Brown in 1902:
Also according to this small note in a 1903 newspaper, a “string” tie without a fat back band fit in the collar best:
Hi there. I was very pleased to see your Tyfold collar presentation. It’s a glorious collar. I’m a tailor specialising in detachable collars, cuffs and bib/bosoms/dickeys. I replicated the Tyfold collar earlier this year. And I have a major Cluett collar obsession. Thank you for your post.
Weirdly this got scuttled into trash by an automatic thing, which is why I did not reply earlier. Since the Tyfold, I have posted lots more collar ephemera which you can find at https://taramaginnis.com/tag/detachable-collars/ and now more at https://costumes.org/tag/detachable-collars/