What year was the 110.28812790 washer made?

The dates of manufacture are determined by the SERIAL numbers on the appliance. The following links explain:

http://www.fixya.com/support/r2880489-determining_age_whirlpool_appliance

Your Kenmore is manufactured by Whirlpool. The first two numbers in the serial number identify the WEEK it was manufactured. The digit preceeding the first set of numbers, identfy the YEAR.

http://www.fixya.com/support/r2880528-determining_age_maytag_appliance

On Maytag models, the last two letters in the serial number determine the date of manufacture. The first letter is the YEAR, the second letter is the MONTH.

If you have any questions, please let me know. I hope this helps you.