It's about 5,000 times as heavy as a Raindrop.
In other words, the weight of a Raindrop is 0.0002 times 643.0329 pennyweights.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.10 pennyweights. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about one-six-thousandth as heavy as an Elephant.
In other words, 643.0329 pennyweights is 0.00017 times the weight of an Elephant, and the weight of an Elephant is 5,900 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 3,900,000 pennyweights. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and weigh up to 58,000 pennyweights.
It's about one-six-thousandth as heavy as a Tyrannosaurus rex.
In other words, 643.0329 pennyweights is 0.00016 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 6,300 times that amount.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 4,100,000 pennyweights while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about one-ten-thousandth as heavy as an Anchor of a Cruise Ship.
In other words, 643.0329 pennyweights is 0.00008850 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 11,300 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 7,270,000 pennyweights. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about 35,000 times as heavy as a Grain of Rice.
In other words, the weight of a Grain of Rice is 0.0000290 times 643.0329 pennyweights.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.019 pennyweights. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about one-seventy-thousandth as heavy as The Space Shuttle.
In other words, the weight of The Space Shuttle is 71,000 times 643.0329 pennyweights.(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 46,000,000 pennyweights. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 13,000,000 pennyweights.
It's about one-one-hundred-thousandth as heavy as a Blue Whale.
In other words, 643.0329 pennyweights is 0.000009570 times the weight of a Blue Whale, and the weight of a Blue Whale is 104,000 times that amount.(Balaenoptera musculus)
Blue whales weigh between 67,200,000 pennyweights. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.6430 pennyweights each.