I ordered some PCV valves based on a picture, out of New Jersey. Turns out to have been a stock sample photo, so I'm returning the lot, HOWEVER, one does have a production-style stamping:
SPARK PLUG
TYPE CV-754C
D0AE-6A666-A
i have a few day before I must put the lot in the mail; let me know NLT 26 Feb (Tues)
In the picures, the D0AE-6A666-A is the one on the left, the base appears a bit more gray as I rubbed on it to bring the stamping out.
$10, plus the postage.

if that link doesn't work, try
http://www.concoursmustang.com/forum/index.php?action=gallery;sa=view;id=11852