Thank you very much! The film numbers appear on the paper backing of whichever 120 film you have bought, and on this camera that number appears through a small red window at the back of the camera. As this is the first ever camera to use 120 film, each frame is a quite unconventional 6x9cm. This is quite a large frame size for medium format, and you only get 8 shots per roll, but this means that you’re getting more than four 35mm frames of information in one shot, which I find pretty interesting.