Exceptionally good and reliable A+ seller; thank you ! Shipped promptly and arrived with USPS tracked Ground Advantage service ahead of estimated time. Package arrived intact. Given its age, the Item is in better condition than I had expected, This Keuffle & Esser ( K & E ) slide rule with leather case is just like the one I used years ago. Glad I found it; don't know why I didn't keep mine. It was the calculator craze, that's what it was !