I was only familiar with a few Sherlock-related cards including this one from 2010 Allen and Ginter and an Arthur Conan Doyle Card from Mayo.
|2010 Topps Allen and Ginter #110 Sherlock Holmes|
With a little research on this set I found that it was put out in 1923 and could be found in packs of Turf Cigarettes. As a brand Turf Cigarettes was a part of the larger Carreras Tobacco Company which was based out of London and operated from the early 1800's through the 1950's.
Here is a scan I found of the reverse of one of the cards and you can see the Turf logo. It turns out that there are 25 cards in total in the set.
I also found a scan of all the cards in the set that is a better quality that my photo. After being out of the card game for nearly a year it is nice to be able to add a card set to my list of cards to begin searching for.