Delco Remy 3990290 Horn
 

Delco Remy p/n 3990290 horn, dated 8 J 4 (4th week of September 1968). This is a clean, non-functioning core that needs restoration. $80 plus the ride. PM me here with any questions, and thanks for looking!

I think thats a "J " Sept.. Delco skipped the letter " I "

Thanks Gary. Now that I look at it closer, I can see the 'hook' of the J at the bottom.