Sony stereo MHC-GX470 question

[Tony@1]

Hi, trying to order these chips online and have found the matching number but seeing a second number on the chip and not sure what it means. Could someone help.

 

[73's de Edd]

The VALID part numbers are STK 403-130 and STK 404-130, while the
other superfluous /irrelevant numbers are either being run numbers or code dates.

 

[Tony@1]

The VALID part numbers are STK 403-130 and STK 404-130, while the
other superfluous /irrelevant numbers are either being run numbers or code dates.

Thank you very much 73's de Edd