By Peter Huntoon

Frequent contributor Bob Liddell provided five consecutive notes from a spectacular run of mismatched serials that was found in the $1 Series of 2001 New York BB block.

The problem involves the right serial numbers which are 76445938, 49, 50, 61, 72. Notice that they usually dance upward by an increment of 11 instead of one.

The right serial number jumps by 10 each time this happens, thus accounting for the growing disparity between the right and left numbers.

The number wheel with the faulty behavior is the second in from the right in the right serial number register.

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