Posted By:
Frank WakefieldWell I had a time finding it, too. I knew Mr. Lipset said it was a 15, so it must be there... I finally found it.
It is immediately under the first "L" in Lelivelt. If you enlarge the photo it blurs to the point it is difficult to see.
If you copy the image, then zoom in on that first L, then gradually back out of that, you'll see the little "15"...