Sorting through an old box of 'stuff' the other day, I came across an old ring bound notebook of mine that dates back to the 1970's The two rings are spaced by 80mm and they are 13mm internal diameter. The page size is 162x100mm so shorter but wider than Filofax personal size. It's not particularly high quality, its made from thick card, but it was used quite a bit when I was in my