Rare gun metal cased dual dial 'Calendrier Brevete' pocket watch by J Verhagen & Co Koeln, (Cologne), c.1890, AS-IS. Front with white enamel face (hairline and chip) with moon phase aperture (lacking moon panel and loose gear wheel) to centre of signed Roman dial. Back with calendar dial: outer (5 week) day chapter (wheel setting on bezel not actuating), inner 31-day dial with steel hand (lever set on bezel) and with month aperture (wheel setting on bezel)