Shodan (初段) Judo diploma certificate
Seen in Sherlock’s bedroom in A Scandal in Belgravia
First rank Judo certificate, presented to Sherlock Holmes
( シャーロック・ホームズ )
Priceless / Available if you’re presented with the first Dan degree in Judo
Translated by digdog. ~edit: Just to clear things up, the top image is a similar certificate.