Not sure but most Manufacturers hide the date of manufacture in the serial number. Yours could be 2004 5th month or it could be the 45 th week of 2005. The letter C could also mean 2003. A: 2001, B: 2002, C: 2003 ?? I would suggest the 091171 is a consecutive number of units manufactured.
SOURCE: I recently bought a Craftsman
Usually the quickest way to date lawn tractors is to look for the date code (Briggs and Stratton) or the D.O.M. (Tecumseh) for example. So on a Briggs engine there is a long three part series of numbers: model; type; and code. The code is the date code and the first two digits are the last two digits of the year made, the next two are the two digit month, followed by the next two which are the two digits for the day. This is how I get a decent idea of the age of a mower, assuming the original engine is on the machine of course. If you have a Tecumseh engine, it has a four digit DOM before 2004 and a five digit from 2004 on. The first digit of the four digit version is the last digit of the year. From 2004 on with the five digit the first two digits represent the last two digits of the year. Either way with Tecumseh engines the last three digits would be the day of the year. For example a Tecumseh engine 05222 would have been made on August 10, 2005. If you have a Kohler, I am not sure about that one as I have not had to date one yet, but the vast majority of the engines I deal with for Craftsman, including my own are Briggs and Stratton.
I hope you find this helpful.
SOURCE: Just wondering what year my case dc tractor is. Serial number 617583
Try Case or owners forum. Tractor owners forum for specialists. If you stick case dc on google all sorts of stuff comes up.
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