RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Unstamped letter of recommendation
The Old School RuneScape Wiki also has an article on Unstamped letter of recommendation.

Unstamped letter of recommendation is received from Examiner when starting Digsite quest. It needs to be stamped by the Curator of the Varrock Museum in order to continue on with the quest. If you lose this item you can get another by talking to an Examiner in the Digsite Exam Centre.