The Century Master Studio Camera is really nothing but one of the best lens platforms ever. The correct lens was whichever one got the job done nicely for what the photographer was assigned. Someone shooting catalog pages would want something different than someone shooting portraits. Or both might have found that a Bausch & Lomb Tessar suited the jobs grandly. If it's for display, try to find a big black late Wollensak Vitax #3. If you have your heart set on brass, Cooke was about the only one left finishing them that way in the mid to late '20's. They're expensive. I have a 19" B&L Tessar you can have fairly cheaply. Can't remember what I paid but $155 would satisfy me. It's a street car headlamp proportionate to the camera.