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The Otis King calculator is from a British manufacturer who made these cylindrical models from 1921-1972. It is relatively easy to find information on it and even instructions using an Internet search. I am learning that finding its collector's value is a little more difficult. Depending on the rarity, it could be worth as much as $400 or as little as $30.
Ebay lists slide rules for sale but do not list the values of the ones that were sold. I suspect collectors do not like publishing what the values are because it drives the price up when they go to buy. If you are trying to determine the value of a particular make and model it will take some research on your part.
I started this thread as a Nerd topic but I am finding out it is a serious collectible that can be profitable for those who trade in them. Sometimes they might be willing to pay a lot to get a particular rarity but they are probably also hoping to pick up a valuable collectible on the cheap. I have a friend who sells and collects model airplanes and he sometimes finds models on ebay that are selling for less than $100 and he can re-sell them for $1000.
Bill Pflanz
Ebay lists slide rules for sale but do not list the values of the ones that were sold. I suspect collectors do not like publishing what the values are because it drives the price up when they go to buy. If you are trying to determine the value of a particular make and model it will take some research on your part.
I started this thread as a Nerd topic but I am finding out it is a serious collectible that can be profitable for those who trade in them. Sometimes they might be willing to pay a lot to get a particular rarity but they are probably also hoping to pick up a valuable collectible on the cheap. I have a friend who sells and collects model airplanes and he sometimes finds models on ebay that are selling for less than $100 and he can re-sell them for $1000.
Bill Pflanz