The model number is DF111Z. As lfc said, DF1 is the model designator for a 550 Industrial. The model number for a 555B would start with DF8. The rest of the model number says that it has a diesel engine and no PTO, but I'm not sure what transmission is designated by the Z at the end though. I would be interested in knowing what transmission it has so I can add to my reference material.
The 550 with the DF1 designator was made from 1/75 to late '76. They continued to make the 550 through 1978, but in late '76 the model designator changed from DF1 to DF2.
Since it is a 550, the unit number 6B10B says that it was made on February 10, 1976 during the day shift. That serial number, B275845, is a Basildon, UK serial number, and it would be about right for a 1976 tractor, and way too low for a 1986 tractor.
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