Wonderful - I have just received three more issues of the Ringier Journal de la Mode - from 1964/65, 1966 and 1970. They have again brought a little more insight - like that the shorter pattern numbers probably started earlier than I'd thought, but still were consecutive and therefore help with dating. You can see the update, and also the albums of the new magazines here on the Vintage Sewing Pattern Wiki.
And... I found a pattern I had - in fact that very first one I bought as a vintage pattern, which was also the first vintage pattern I sold - this is from the Spring/Summer 1970 issue: