A video shot in the Marion Wade Centre, you can see the desk that Tolkien donated to charity in 1972.

In the accompanying letter, Tolkien noted that: "It was my first desk, and has remained the one that I chiefly used for literary work until her death in 1971. On it The Hobbit was entirely produced: written, typed and illustrated."

http://tolkienandfantasy.blogspot.com/2016/08/tolkiens-desks.html