Absent the p/n, there's no sure way to tell if this particular example is or is not a Griswold variation. The marking style does not match any of those shown in the yellow book. The one on the website is indeed the same, it would appear. I will most likely find another photo of a variation with the p/n to use as an illustration, so as not to confuse the issue going forward. $3 a bargain in any case.