"He sent in his card with a message" [CROO] In our own digital age, business cards are nearly artifacts of the past. And calling cards? They're so outdated we had to create this episode. Numerous individuals in the Sherlock Holmes stories present their cards to Sherlock Holmes and Holmes presents his card to a few people as well. What's the history behind calling cards and visiting cards and how did they play into the stories? It's just a Trifle. We have bonus content for our supporters: images of Victorian calling cards that might surprise you.

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• Calling Cards and Visiting Cards: A Brief History (Hoban Cards)
• Calling Cards & Paying Calls: Social Etiquette in Georgian England (Paullett Golden)
• The Gentleman's Guide to the Calling Card (Art of Manliness)
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Music credits Performers: Uncredited violinist, US Marine Chamber Orchestra Publisher Info.: Washington, DC: United States Marine Band. Copyright: Creative Commons Attribution 3.0