Diplomat Collection If you enjoy hand craftsmanship and enjoy turn-of-the-century styling, you'll love the Diplomat. The hexagonal barrel is hand crafted in solid sterling silver, stamped with six hallmarks to prove its quality. he original Yard O Led Diplomat propelling ball pen, a classic writing instrument. This ever popular design remains unchanged since 1934 thoughtfully designed, its angular hexagonal shape helps to stabilise the ball pen or propelling pencil on a gently sloping surface such as a draughtsman's table.