Great vintage Big M Seed cap.   It originally had a foam liner when it was made.  These age poorly and literally turn to dust.  So it has been hand washed, air dried on a cap form.  It is made by K-Products Caps in Orange City Iowa. There is missing stitching and some staining on the bill.  The bill insert is kind of crunchy.  It may be an older composition material so forming may need to be done by steaming. Very good used condition and great retro look! 
 
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