Assuming it"s a North American spec tractor:
52 PTO HP 206ci 4 cyl diesel
Built in IH"s Doncaster factory in UK.
XL means flat floor factory cab
Should have 8F/4R syncronized transmission (16F/8R optional)
The XL version of the 585 was available in North America 1987 to 1990.
Should be a good tractor, I"ve always liked this line of tractors.