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<p>[QUOTE=&quot;wlwhittier, post: 1850918, member: 18320&quot;]Upon reflection, it occurs to me that this wear could have come about quite naturally: on the floor (or in the trunk) of an automobile.</p><p><br /></p><p>Think of that rusty surface, common in days of yore when water had ready access to the interior of many vehicles.&nbsp; Those areas became covered in heavy, scaly orange flakes of ferrous oxide...a dark gritty slurry when wet, simply a dusty abrasive granulation during periods of dryness.</p><p><br /></p><p>A coin fallen from a pocket or purse to this surface would slide around as acceleration, cornering and stopping of the vehicle propelled it across this rough surface, which was constantly renewed in abrasive ability by months and years...decades...of wet/dry cycling.</p><p><br /></p><p>When found, the wear on the coin would be very like what is seen here; with the rim having suffered first, then the other features somewhat more slowly eroded as the mass/area equation changed.</p><p><br /></p><p>Anyone have issues with this conjecture?[/QUOTE]</p><p><br /></p>

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