555 or triple nickle is slang for this model. Spanked might be compared to "beat", my father would have described it as rode hard, and put away wet. It is used by a family operation. The recently deceased old man cared deeply about caring for his machinery. He wasn't a super mechanic, but preventive maintenance was something he understood very well. His much younger brother is now 75. The rest of the users are a younger generation, or two. His nephew is a Hell of a fine mechanic with a work load about triple his capacity. The 555 is now not considered to be a part of the first string of machines. In a reorganization following the bosses death, the boss's son now owns the 555 as his personal property. He'd need triple A to change a flat tire, and does not spend money, EVER! It won't improve.
Got it. Thank you for the explanation. Makes perfect sense.
Also thank you for the short history of your family. Lots of information in that small paragraph!!!! Wear your family heritage with much pride!!!!