A website called Antique Tractors has information about Allis Chalmers model G tractors. If the tractor is working, restored or complete will influence the value. Previous sales prices range from $600 to $2300.
Another website called Yesterdays Tractor also provides pricing information on Allis Chalmers G tractor. Their average selling price is $3590.82 with a low of $500 and a high price of $8500.