just multiply. 1" actual is 87" in real life.
The rear wheels would be about 4ft tall, making the bandsaw around 10 ft tall.
10 ft is 120" Divide that x 87.
that makes a 1/87 scale to be 1.37" tall on the model.
if 1 = 20mm
then 87 x 20 = 1740mm
1.74 metres is only 68"
Thats 5 ft 8" to the top of the saw.
That real life tractor is only 4 ft tall at its highest.
is it an import from Lilliput?