Type 1 / Type I Curta Calculators were the original model of Curta Calculator. Depending on when they were made, a Type 1 Curta Calculator body can be made of either plastic or metal. Regardless of the body material, all Type 1 Curta Calculators are functionally the same. Type 1 Curta Calculator models have 8 input registers, a 6 digit crank turn register, and an 11 digit result register. They weigh approximately 8 ounces and were originally sold with a plastic or metal carrying case.

Beginning in 1948, over 80,000 Type 1 Curta Calculators were made and sold. Many of them survive today and are available for sale in antique shops and eBay. Below, you will see all the Type 1 Curta Calculators currently available on eBay.