William Marston was born in the UK in 1822 and emigrated to the US in the 1830s with his father, who was a gun smith. William became a naturalized citizen in 1843, and in 1844 went to work for his father in the family business. He would later open his own shop, and became successful making a wide variety of firearms – mostly concealable pocket pistols – until his death in 1872.
This is one of his 3-barrel derringers, with a pretty neat auto-indexing system. This one is in .32 rimfire with 3” barrels, although 4” barrels and .22 rimfire versions were also made. Production began in 1858, but really picked up with the addition of an extractor in 1864. That improved model would see some 3300 examples made.