It's about as heavy as a Human Brain.
It's about one-and-one-third times as heavy as a liter of Water.
In other words, 868 pennyweights is 1.349853 times the weight of a liter of Water, and the weight of a liter of Water is 0.7408214 times that amount.(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 643.0329 pennyweights rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about three-fifths as heavy as a Chihuahua.
In other words, the weight of a Chihuahua is 1.67 times 868 pennyweights.(a.k.a. Chihuahue(o) (FCI standard)
It's about half as heavy as a Brick.
In other words, 868 pennyweights is 0.47 times the weight of a Brick, and the weight of a Brick is 2.1 times that amount.(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
It's about two times as heavy as a Basketball.
In other words, 868 pennyweights is 2.1643636364 times the weight of a Basketball, and the weight of a Basketball is 0.46202956988 times that amount.(NBA official ball standards, Size 7)
It's about three times as heavy as a Football (Soccer).
In other words, 868 pennyweights is 3.1 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 0.32 times that amount.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
It's about three-and-a-half times as heavy as a Football (American).
In other words, 868 pennyweights is 3.283862068966 times the weight of a Football (American), and the weight of a Football (American) is 0.3045194892473 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 255.2083333333 pennyweights and 273.4375 pennyweights. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.