I can't believe the 907 kg weight, it just DOES
NOT make sense!
It makes perfect sense, when you consider that the original spec
was NOT metric.
If somebody said, "It weighs a ton! (figuratively), OR
it was something between 1000 pounds and 3000 pounds,
and ROUNDED to "a ton",
then automated unit conversion, or some idiot that doesn't understand the
error of adding significant digits to a less significant number, . . .
results in 907 Kg
I'm surprised that they didn't tell you that it weighed 907.18 Kg.
So, figure 1000 Kg, plus or minus 400