Here's an incomplete L.G. Tillotson Arched Camelback telegraph key that dates to the mid-1860's.
The key is missing a terminal and an adjustment screw for the lever (and possibly part of the thread for that screw), and it is being offered for parts and/or restoration, with no other assurances stated or implied.
Despite its flaws, this is an uncommon and very desirable key that would clearly be worth the time it might take to "get it right."
Please note: there may be other issues as well as those mentioned above, so make sure to review the photographs and consider them an integral part of the description.