Didn't you all see the winking face?! No, you're right, it was a rather smug reply. My apologies to the OP. But I stand by my feeling that the OP didn't try hard enough to find out the info on his own. I, too, recently picked up a 60s speedster, and found all the info both the OP and I needed on the link I provided above.

And then someone had to email their friend who says it's under the head badge, when in fact the OP says he has a 60s speedster and the link I already provided indicates it should therefore be found on the left rear dropout. No offense, but kind of a waste of time.

From my '68 speedster: