WHOA!

It's mono monday and the theme for the day is "OLD."
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This is a 1920 Duesenberg Straight 8 seen riding around Road America.  Being 105 years old....I'm guessing it's old enough to fit the category.  Check out the size of that crankcase!  It's also likely the inspiration for the phrase "...man, that's a real Duesy!"
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BEST IN LARGE.