You have to compare the serial number to a chart that shows what year it was made.
1924 was the year of conception for the farmall tractor international harvester. their designs wouldnt change again untill 1955
The last tractor branded as a Farmall was in 1975.
A Farmall A with a serial between 281569 and 300125 was made in 1950. Source: http://www.geocities.com/mck357/serialnumbers.html
fbk-94458
1975
The model H was introduced in 1939.
1947
1962
In your mom's butt
You can check at TractorData.com or link below
frist year they made 8n ford tractor
2006