Hello Bill, Jon and All ! At least some Knabe concert grands did indeed have different ser. numbers. The information I have gathered over the years has the number 10135 built about 1912. And number 10927 built about 1929. At this time I have no other numbers. Also during this time Knabe had some of their '9's built by "A B Chase" in Norwalk Ohio. Also some ( maybe all ) Chickering '9',s had different numbers. Ser. number 15327 was built about 1925. Even though American Piano Co. bought both Knabe and Chickering in 1909 production was not moved to E. Rochester until 1929. This twenty year time span seems to fit with the information above. To Bill Shull and every one else who I did not respond too I apologize. After getting so far behind at the first of this year I just could not catch up. Thanks to all who send me information, a bit of information alone may not seem important until it is combined with others. Regards to All, Jack Wyatt
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