LM3658: Burr Brown topside mark date code # 3650KG

Tool/software:

Hello,  We recently sold stock of an old Burr Brown part # 3650KG that isn't in your part numbering selector so I selected the LM3658, sorry. Any chance you know what the date code was for Burr Brown products back in 1996. I know this predates TI's acquisition. Hoping you have an archive to reference. Attached is a photo of the topside marking. 9622 (year = 1996, week = 22) looks like an date code, would appreciate clarification.

   thank you, Kevin