Meyerco Sharpen-It

This is a compact knife sharpener ideal for the field, glove box, tackle box, etc... It has been used but still serves the purpose. I found an online page reviewing multiple types of sharpeners, here is what they said about this one:
 
"There is one class act in every category, and the Meyerco Sharpen-It is it for slot gadgets. Designed by Blackie Collins to be so simple that it could be used on horseback, the Sharpen-It features tungsten carbide wheels for the first stage and fine ceramic wheels for the second. The ceramic is so hard and fine-grained that it is more like using a steel. With this combination, the Sharpen-It performs well at both sharpening and honing.
Unlike other slot devices, the Sharpen-It adds a third wheel to each set, giving two slots, and shapes them so that they sharpen one side of the blade at a time. This setup allows you to vary the bevel angle somewhat. Drawing the knife through at an angle decreases the bevel angle and gives a more razor-like edge. Since it is assembled with tamper-proof screws, I could not measure the bevel angles, but this information is less important because you won't have to use it with another sharpener to get complete results.
Also unlike others, the Sharpen-It can be used equally well left-handed. It is so compact when closed that it can be carried in the watch pocket of your jeans. The unit well built and sturdy, and features a tapered hone for serrated blades. A less expensive model is available without the tapered hone."
 
L 4 1/2", W 1 3/4", D 1/2'