Going through stuff I don't need any more before we move, I found my Jeppesen CR3 circular slide rule. This is the BIG brother to the CR2, and is great for pilot's with aging eyes (CSS Syndrome)
Also called a Prayer Wheel by aviators
100000000 times better than the other slide rules, and does ALL calculations including mach calculations etc.
Selling this one for $30 including postage.
Does NOT have the protective sleeve, but they are a nuisance anyway.