Long the preserve of fusty country gents, the venerable British footwear brand Grenson has enjoyed a renaissance in the hands of the designer Tim Little; its sturdy handmade shoes and boots are now prized by footwear fetishists from Hackney to Tokyo. This year, the label is celebrating its 150th birthday — in understated British fashion. It has re-editioned eight styles from the last century, including an awkward-looking orthopedic Oxford from the 1930s named the “Grenson Joy Step” and a 1940s infantryman’s boot.