Vintage Slide Rule-21031206mm

What can I say? It is a slide rule. It is old because hand-held calulators were available when I was in graduate school in th 1970's. I thought all these slide rules had become firewood.

The photos will have to tell you the rest of the story because I could not use this gem if my life depended on it. I'm old but I think this thing is older than me.

It measures 12" and then there is that slide thingy that extends out.

I'm looking for someone that collects antiquities.