Keuffel & Esser Slide Rule - Value?

[mjm579]

Now I just need to figure out how this thing works

 

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[mjlalt]

According to Ebay completed listings
Anywhere from $1.29 to $887.93

 

[GMD52]

You might want to check the model #, some of the older ones were made of ivory.

 

[gord]

And then some, like the one that I picked up some 50 years ago, were plastic-coated bamboo.

 

[clovis97]

I bought 6 slide rules for $1 each about 6 months ago. Five of them sold for $30 to $35 each on the 'bay. I trashed the oldest one, which was broken pretty badly.