The breakdown of the serial number for a Bristol Reciprocating Compressor is: 

Digits 1-3: Julian Date of Manufacture 

Digits 3-4: Year Manufactured 

Digit 6: Mfg Location - 0 or 2 = Bristol 

Digits 7-11: Sequence # During Week

The breakdown of the serial number is 

Digit 1: S for Scroll Technologies 

Digits 2-3: Week Manufactured 

Digits 4-5: Year Manufactured 

Digits 6: State (K for Arkansas) 

Digits 7-11: Sequence # During Week

Tecumseh Compressor Serial Number Lookup