Rolleicord I

There is the frame counter at the left-hand side of the camera body.
Only the first frame has to be seen in the film counting window (shown in the left picture), but the rest can be seen on the frame counter.
Note: Automatic film transportation is not on this camera yet, so wind the film to the next frame carefully.
The frame counter indicates you when to finish the film with the red-colored dot on it.
(Set back the frame counter to "1" with the button below the frame counter after loading the new film.)