It dates from the 1960's or 70's. The cursor was missing and I made a new one for it. A perfectionist might not like it, but it is functional and looks pretty good. The finish on the rule is goodt noting that there is a clear coat on it that is flaking off in places, leaving the original paint below. Please look at all the pics to see the details and condition.We are full time antique dealers who have been at this for over 30 years. Our descriptions and our photos are never designed to misrepresent or over-embellish our merchandise. Keuffel & Esser / K & E 4053-3 Polyphase 7' Classroom Teaching Slide Rule" is in sale since Sunday, January 19, 2020. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules".com" and is located in Gold Country. This item can be shipped worldwide.