Sevenfriday M-Series Urban Explorer Automatic M1B/01M SF-M1B-01M Men's Watch The distinctive M-Series is the most distilled iteration of SevenFriday watches! With this one, you may just as easily dress up, juxtaposing cleverly constructed components in a contrasted but definitive and futuristic twists. Together, they create a modern classic – the Urban Explorer – which is, arguably, the signature piece of the brand; much less conservative than their futuristic and open-worked predecessors.