Decent looking bolo, any markings on the blade or cross guard? The K-6270 is I.D. of a soldier who it was once issued to. The letter is the first letter of the last name followed by the last four digits of his service number. Some gear I have has several I.D. numbers on it. Gear wasn't always marked, but if you chose to mark your gear this is the proper way. The other numbers/letters appear to be unit numbers.
Steve