1977
The extant serial number list for Kimball would indicate it was built about 1904.
A 5-digit serial number on a WW Kimball piano indicates a failry early model. As far as we know, Kimball pianos produced in 1900 started at serial 71000, so this would have been built BEFORE then, but sometime after the company's inception in 1893.
In 1890, Kimball was still using 4-digit serial numbers (starting with 3200). By 1895, however, the company had jumped to 35000. Considering this, a model with serial number 28527 would have been built at some point during this fiver year time frame, most likey in 1893-94.
what year was a Hitachi excavator built with serial number 133 2797
It was built in 1959!
it would appear there are too many numbers in your serial number.....................
about 1918
about 1905
about 1918
about 1929
1917
1924