Circa 1910 means that the exact date is unknown but that the best guess is 1910. The probability of it being X years later than 1910 is the same as the probability of it being X years earlier than 1910. As Doug acknowledged, the text was incorrect and it was/will be corrected. The person who said that it pertains to the period from 1910-19 is just plain wrong. Also, there is no dealer convention in the English language, possibly only one in the "self-serving bad English" language.
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