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I think you'll find your answers here. TN is a Merc M-7, 81 is a conventional cab, B is the deluxe cab called a "5 Star Extra", H is left hand drive, 51 is 1951, 5005 is the unique serial number. Stu
The engine should be a 337, assuming Canadian specs are the same as US. The 239 was only used through the F-6. The rest of your number needs input from the experts. Stu