need help findeing year

[kevindean]

just bought a international harvester cub cadet 1250 hydrostatic 12hp kohler motor serial#2050063u535 need to know year if someone can help thank you

 

[ILENGINE]

1990

 

[willys55]

1974: 530001
1975: 536073
1976: 572840
1977: 602118
1978: 621744
1979: 643507

number is on the left side near the pedal