Military Dolphins Discover 1800s Torpedo
First time accepted submitter The0retical writes "A couple of mine-sweeping dolphins dredged up what is known as a 'Howell torpedo' dating from 1870 to 1889. Only 50 were ever produced, this being the second example known to exist. The 11-foot-long brass torpedo had a maximum range and speed of 400 yards at 25 knots. The new example will be displayed at Naval Undersea Museum in Keyport, Wash. alongside the only other example."
Saying the 1800s implies a date from 1800 to 1809. You should have said late 19th Century, or at least "from around the 1870s".