Ann and I have been proud members of the Illustrious Clients of Indianapolis, a venerable scion society of the Baker Street Irregulars, for some years now. We received handsome certificates of membership earlier this summer during the club's annual field trip.
Sherlockian membership certificates have been around almost as long as the BSI. I love them, certificates, although the Tankerville Club of Cincinnati doesn't have one. What's your favorite?