I just cannot make up my mind which one I should buy and look forward to your comments and recommandations. I like both, maybe the reserve de marche is a bit more dressed and the calendar slightly more technical (but still quite dressed as well). The reserve the marche looks larger though both are 39 mm. The calendar comes with more complications for only little more money. Hard decision to be taken!! It sill be a steel one, this is sure. Many thanks for your advise. Paco