Yes you've read it right the original 110 film 5"x4" exposures on roll film. I have an Alliance Roll-film Camera Co. Ltd, 110 camera, shutter is accurate and lens in excellent condition, I need a second (or more) spool and an indication of the spacing between exposure no's on the backing paper, I have some thin aerial film I can slit to width.
Do a Google search. There is a company which prints backing paper for old roll film sizes from which a friend bought exactly the same thing a year or so ago. If I could get in touch with him easily to ask, I would do so.