Amana

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Style 1:
The Date of Manufacture is in the first four digits of the serial number and represent the month and year of production:
0804237529
08 04 237529
08 Year
04 Month (April)

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Style 2:
The Date of Manufacture is represented in the first two digits of the serial number and the year of production:
96-90491
96-90491
 96 Year 

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Style 3:

The Date of Manufacture is in the first four digits of the serial number and represent the month and year of production:
040590491
04 05 90491
04 Year (April)
05 Month