Tuners sometimes leave a card or label inside the piano and write the date each time it is tuned. I didn’t pay attention to this faded old label last time I called, but this time I looked more closely and realised it was one of these date record labels.
Have a look at the dates. The one you can see most clearly is 16/1/99. Today is 20/1/12. But, gentle reader, that older date is not 1999, but 1899. One hundred and thirteen years and four days ago, a tuner got his fountain pen out, and recorded his work.