Referring to the Dennison Watch Case Co.,
"This was the most successful and best known of the English watch case manufacturers ..."
Watch Case Makers of England, Philip T. Priestley, NAWCC Bulletin Supplement 20, Spring, 1994, on page 69.
It was founded in Birmingham in 1874 by Aaron Lufkin Dennison (ALD), a person instrumental in the development of the American watch industry. Mr. Priestley says on page 70, "Over the years, Dennisons made cases for Dreyfus, Newmark, Omega, Smiths, Rotary, Avia, Vertex, Rolex, Rone, Rotherham, Thormens, Perrin, Benson, Dimier, Hirst, British Watchcase Co. Ltd., March & Lobin, Huber, Zenith, Gibson, Longines, Marvin, Cortebert, Marc Fauvre, Baume, Marchand & Tobin, Medana and Roamer."

Mr. Priestley's book reproduces a 1906 Dennison Watch Case Co. ad detailing four different registered marks:

Case Grade	Case Material
ALD	9 ct. and 18 ct. Gold, or Silver as marked in back of case (there are no periods between the letters)
Sun Trade Mark	Gold-Filled, guaranteed for 25 years (may also be marked with "A.L.D.")
Moon Trade Mark	Gold-Filled, guaranteed for 20 years (may also be marked with "A.L.D.")
Star Trade Mark	Gold-Filled, guaranteed for 10 years (may also be marked with "A.L.D.")

See the Case Material Wiki article for an explanation of the terms.

For more information on Aaron Dennison refer to the Wiki article: Dennison, Aaron Lufkin

Books
The following book is available to members on loan by mail from the NAWCC Lending Library, using the Lending Library Form.


Watch Case Makers of England, Philip T. Priestley, NAWCC Bulletin Supplement 20, Spring, 1994