Selling my Otis King cylindrical slide rule

[johnbear]

It's identical to the one depicted on the Museum site, except instead of a box, it has a cylindrical leather case. I bought it in England in 1972, and have used it, oh perhaps three times in 43 years, to impress (or baffle) my grandchildren. Here's a long article on it from the site of the National Museum of American History: http://tinyurl.com/mkwwxjh

So now that I am old, and divesting myself of lots of stuff, I'd like to sell it. What can it be worth? "Make offer" sounds so cavalier, and I apologize. I cannot find one for sale on the Internet, although there apparently was one on eBay a few years ago at around $100.

What the heck. Make offer. Thanks.

John Bear
A real person (http://www.johnbear.info) in Berkeley, California[/size]
john.bear@mac.com