I posted in the conversion forum about my newly bought tractors.
I was quite sure the Super Major was July 21st 1961 castingcodes saying J21F.
But in a different table, later Majors from 1963 can have the same castingcode but the date would be June 21st 1963

That date would be one of the last prodctiondays before the New Performance series started

The engine was replaced, but the original engine number is suppossed to be 161250 4.
Can anyone bring some light into the darkness?