Handstamp on an SS5 form

It took a little while, but I think I have finally figured out what the hand stamed entry on a 1963 SS5 form stands for.While it is not a major clue, at least I know what it means.

There is a link to the image of the SS5 form here:

http://www.rootdig.com/2009/09/ss-5-card-and-that-stamp.html

After getting a few suggestions of what it could stand for, I googled it with the words "social secutiry" and came up with some interesting webpages.

Michael