Age of Tecumseh compressor

Commercial inspection, buyer asked if I could get him the age of the compressor for the beer cooler. Tecumseh serial # 253711 anyone got an age?

Did you get the correct number?

**Tecumseh Date Codes **

The breakdown of Tecumseh Serial Number is:
First letter is the Month according to the table:
The next two numbers: Day of the Month
The next two numbers: year

Tecumseh Month Codes **Code ****Month **A JanuaryB February C March D April E May FJune G July H August I September J October K November L December

Number on tag on top of compressor. I wonder if compressor serial # are different??