If it's a Chicago Kingsbury (check the plate or the case for a company or manufacturing location), it would have been built by the Cable Company of Chicago. If that's the case, the 5-digit serial indicates this is a pre-1909 unit. The Blue Book of Pianos notes the company started producing #65000 in 1905 and was at #140000 by 1910. With that in mind, yours would most likely be have been built some time in 1907-08.
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where is my serial number on my kranich&bach piano
The krell piano serial 10533
How old is a Packard Piano serial # 134410
There is no piano records of a Sohmer that has a serial number of 155346. Try looking again at the brand or serial number. I've added a link that lists every piano's brand and number.
According to my copy of the Pierce Piano Atlas, the Baldwin piano with serial number 127398 was manufactured in 1954.