Good find wce. Looks in better condition than mine.
Maybe the 5hr was from its first service back in the day - though I have never owned a new mower I am fairly sure a first service is 5 hours???
Mechanic probably figured no one would notice it under there. But usually there would be a date after it otherwise its quite useless on its own
I think the 72db difference is overrated - though it is slightly noticeable. When new, with a tight carby, there probably was more of a difference.
Lawn is looking mint by the way
Regards