date code on nos radiator hose question
 

I picked up an upper nos radiator hose mostly to learn from. It has 42846 at the start of the 8" stripe. Next a 1" break in the stripe then 76 EX. 50 E8 K 12 11 0 Z28 46 then the stripe resumes to the end. The part number is 3923229 KU for small block camaros. Anybody know if the numbers are a date and batch number?
Dustin