The flight was jointly organized by the Deutsche Zeppelin-Reederei (DZR) and Standard Oil of New Jersey (Esso), which supplied hydrogen and diesel fuel to the Hindenburg, and each passenger was given a souvenir duralumin ashtray with a glass model of the airship filled with Esso diesel fuel.
The fire started in a workshop and rapidly consumed the building, listed on the National Register of Historic Places. Fortunately, many of the iconic dies were spared.
http://www.post-gazette.com/pg/10066/1040959-54.stm. Wendell August Forge history.