http://www.teleskop-service.de/Selbs...el/spiegel.htm at the bottom. by my german is very rusty (ie non existant) have to try to translate that.
EDIT: translated it - very badly too LOL
We can make each self farmer of Newton telescopes an irresistible offer, naturally are new the mirror: The following complete package we offer to you: Hauptspiegel 16"f 4,5 -- illustration guarantees better, than diffraction limited -- diameter 406mm -- thickness at the edge 42mm -- mirror carrier B 270 -- aperture ratio 1:4,5 Catch mirror -- diameter small axle 88mm Okularauszug -- 2"Crayford okularauszug with ring wedging and reduction on 1,25" -------------------------------------------------- The absolute complete price for all three products........................... ................................... .......................... Euro 1250, - That is an introductary price, which is only limited valid, we gotten only a number limited by this set pure. ---------------------------------------- Of course we offer also hauptspiegel and catch mirror versions in high-quality execution to you. Left to mechanical parts for the telescope - self's building.