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Back of Frog seat
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Not tapped for adjustment screw. No patent date cast into sole. No raised ring for knob. Don't know of any type which would have these features.
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IMG_1453_(600x800).jpg
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IMG_1455_(800x600).jpg
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IMG_1451_(800x600).jpg
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IMG_1450_(800x600).jpg
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IMG_1297.JPG
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