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This is a page from the 1927 Sears Catalogue. |
I believe the following collars to be dated from around 1920 to 1930. It looks like the style went from hard collars to soft collars. Most likely because they were more comfortable. As you can see they also became more stylish with the collars and stripes.
 
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With the color and style I would have to say this the 70's equivalent of the separate collar. |
 
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I would say that this collar is from the 30's because of the complexity. |
 
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