| The Pen F is somewhat wide, and the shutter is noisy. Originally took the PX13 mercury battery, which is no longer available (works great with hearing-aid batteries).
Great piece of engineering, however.
The Tessina with a chimney finder might fit the bill, although it isn't full frame.
But basically, what you want doesn't exist. And there is a point where an SLR can be too small.
The Yashica/Kyocera Contax cameras are well made, and the Carl Zeiss lenses are outstanding. The Minolta XD11 has a well-damped shutter and is among the cameras that were part of the mid-1970s downsizing that occurred (led by Olympus). | 
