Is your copy of Master Detective a potential collector's item?
Maybe. Here's the story:

The first printed versions of Master Detective contained a misspelling on the cover. On the spine, the word "Detective" in the title was spelled "Dectective". To correct the error, Kensington Publishing, the company that owns Citadel Press, recalled all these early versions and replaced them with corrected copies.
So does that make it a collector's item? Well, it's a good bet that there are people who do collect such things, and thanks to quick action by the publisher, the supply is limited, so why not? After all, errors in stamps are eagerly sought by collectors. Anyway, it makes for a good story, and what's a book without a good story?
John Reisinger