This vintage Ortho-Phase Log Slide Rule, model 500-t by Pickett & Eckel, is a must-have addition to any collector's inventory. 

Made in the United States, this slide rule is a rare find and a testament to the quality engineering of the past.  

The slide rule comes in a soft leather case with open sides, need sewn see picture

There is a pink spots on ruler and missing two screws

The case shows some light marks from general use. 

Nice piece to add to your collection.

The item in the photos is part of the description and is exactly what you are purchasing. 

Thank you & have a great day.

Check out my other auctions Thanks.

We accept all payment options.

Ships next business day.

Please see pictures for details.

FREE SHIPPING