John Denver wearing a Marshwood frame. The Marshwood frame was introduced in the 1930s and remained popular until after World War II.

We have many similar frames. Some are listed below:
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Vintage Eyeglasses Shuron Shurset 1/10 12k Rimless Antique Frames 46-20$175.00
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Vintage Eyeglasses Shurset Shurset 1/10 12k Rimless Antique Frames 42-20$175.00
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Vintage Eyeglasses AO Numont 1/10 12k Semi Rimless Antique Frames 42-20$175.00
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Vintage Eyeglasses Benson 1/10 12k Rimless Rimway Fulvue Antique Frames 44-20$175.00
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Vintage Eyeglasses AO 1/10 12k Rimless Rimway Fulvue Antique Frames 42-22$175.00
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Vintage Eyeglasses B&L Rimway Numont 1/10 12k Semi Rimless Antique Frames 42-20$175.00
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Vintage Eyeglasses Silver Tone Ovid Antique Spectacles$145.00
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Small Antique Eyeglasses Frames 41X38 1940s Ful-Vue AO Vintage Glasses$155.00
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Vintage Eyeglasses Silver Tone Ovid Antique Spectacles$145.00
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Antique Eyeglasses Frames 43X40 1940s Ful-Vue Shuron Vintage Glasses$155.00
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Antique Eyeglasses Frames 43X40mm 1930s American Optical Ful-Vue Vintage Glasses$165.00
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Vintage Eyeglasses Shuron Gold Tone Ful-Vue Antique Spectacles$155.00