0197 is correct, just look at wear of the numbers, and with the whole oil thing the least amount of wear would be the last one and the most wear is the first. 7 has the least amount of wear, and the 0 has the most wear.
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but seriously. I love how the book John chose was the Science of Deduction. That's the one that Sherlock chose to trigger the bookcase. John would only choose that book once he had become so sentimental that he could not think of
Remember that time when we all thought Mycroft was Moriarty. Remember that time when we all thought John was Moriarty. Remember that time when that gay guy turned out to be Moriarty. Well that sums up season 1 well