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It's possible. Copies of the 7th edition seems to have been reprinted over in India in recent years; but an original dating from 1915 ought to be more collectable.
As @etr221 hints at, we can't really provide a free valuation service on here, but reckon your book, as an original, if in good condition, should be more collectable than a recent copy/reproduction, but can't imagine it's worth more than some ££ (double digit) sum.
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