Interesting Models, Rydal, Derwent & Ribbon.

Akroyd, Now Hear This!Akroyd, For Enduring Harmony

I’ve recently been sent an interesting piece of literature by David Sawyer, which he acquired with a pair of Coniston’s from the US. It mentions three models of Royd I’ve not come across before, Rydal, Derwent & The Ribbon. The Rydal is a 14Ltr reflex box, The Derwent a large 3-way speaker and The Ribbon a very large box with Decca London Ribbon tweeter.

Does anyone know anything about these?