Searched the FDA website There's 24 imprints for
hydrocodone used by Vintage/Qualitest. The majoriy of them start with 38xx,359x,or 3600 thru 05. No 3696 imprint found. Could you check that this imprint is correct?
Darvocet is either 511x or 546x.
I tried but can't find anything with that imprint.
I might not always be right, but I'm never wrong.