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I think the part of the number codes '11 12 20' refers to the casting date. I have restored two Kohler tubs with the last number in the sequence being '14' and '15' from residences in Richland Center, Wisconsin that I know were built/upgraded around the 1917 - 1920 time frame. But, I have found a definite reference for this yet.

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โˆ™ 2011-09-14 01:57:51
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Q: What do the casting numbers 64-5-M 9 11 12 20 41 83 60 refer to on the bottom of an old Kohler clawfoot bathtub?
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