The C330 was released in 1969 as part of the Mamiya C series of interchangeable lens medium format TLR cameras. It is an improved version of the Mamiya C33. Similar to other models in the series, it supports interchangeable finder viewing system allowing options such as a chimney style magnifier, eye level prism and the traditional waist level finder. A new feature of the C330 is interchangeable focusing screens. There are six additional types of screens available. It can be changed by first removing the finder, extending the bellows and rotating the lever on the front of the screen holder. The lens parallax selector knob has been redesigned with more focal lengths which now include the 55mm, 65mm, and 250mm lenses. The film transport system is similar to the the previous C33 model, the C330 uses a film advance crank and supports cocking of the shutter automatically during the winding stage. The film counter is automatically adjusted for 120 or 220 film. There are two shutter releases, one on the lower right hand side base of the body and another plastic downward firing one at the right side of the front standard.
If you want to know more, Camerawiki has written a small review.
Camera, 2x Mamiya-Sekor lenses (80mm 2.8 and 135mm 4.5 Both Blue dot) original case and instructions.
Cosmetic: Overall good condition, with normal signs of use and age.
Optical: Viewfinder clean. 80mm lens is clean with minimal dust. The 135 has a large dust/dirt particle in the middle.
Mechanical: All shutter speeds are accurate and all mechanical functions are working