Thank you for looking. Sherlock Holmes Museum This is a rubber duck keyholder in the Sherlock Holmes design. I purchased it at the Sherlock Holmes Museum on Baker Street, London in November 2025. I bought it as a souvenir, but I have extras, so I am offering it for sale. It has the Sherlock Holmes Museum mark on the bottom and the back. The approximate size is 5cm long, 4cm wide, and 5cm high.