All Curtas listed for sale here have been cleaned, adjusted, and lubricated according to factory service documentation, using factory tools, fixtures, materials, and methods. All mechanical anomalies found on these machines have been corrected. Any items that required replacement have been exchanged with NOS (New, Old Stock) factory original parts.
All of these fine instruments are guaranteed to operate as they did when originally delivered from the factory.
Some Curtas are supplied with their original instruction manual or other paperwork such as a warranty card. If original paperwork is not stipulated, an excellent English language reprint of Contina's instruction manual entitled, "Instructions for Use of the Curta" will be provided. An original Scientific American magazine publisher's "tear sheet" of their January 2005 article, "The Curious History of the World's First Pocket Calculator", will also be included with each Curta purchased.
Unless mentioned otherwise, each Curta comes with its original metal or plastic canister. The condition of the canister is identified separately from that of the Curta itself. If no canister is supplied the listing will state so.
Some Curtas come with both a canister and a leather case. And some Curtas have only a leather case. When only a leather case is supplied, this means the leather case is designed to hold the Curta without a canister. When a canister and a leather case are supplied, the leather case is sized to hold the Curta within its canister.
Shipping is extra. Generally, Flat Rate Priority Mail shipping to locations within the US is the least costly. Insurance is optional. International shipping via Registered Airmail is recommended. Of course, any requested shipping method can be arranged.
Prices are based on model (Type I or II), condition/quality (internal as well as external), age (determined by serial number), style (components used during the original assembly), accessory items (type of canister, literature, etc.), provenance, and overall appearance.
Do keep in mind that the cleaning, adjusting and lubrication service work peformed on each of these Curtas amounts to several hundred dollars, and must be considered when making price comparisons.