The lock has "WILSON/1746" at the tail, the Georgian cipher at the center, and non-bridled pan. The furniture is brass and has some simple engraving. The barrel is inscribed "London" in scrip on top along with "FOR HIS MAJESTY'S REVENUE CUTTER SWALLOW" and has scroll engraving, "crown/P" and "crown/V" proofs flanking the "crown/RW" maker's mark, and a muzzle that flares to 1 1/4 inches (main bore listed above). In the 18th century and early 19th century, multiple revenue cutters were named the Swallow. During wartime, they operated as privateers, including one under Captain Thomas Amos who made several captures during the French Revolutionary Wars.