I suggest avoiding equipment in poor condition, as a general rule.

My recommendation is always to buy the very best example of the equipment you are looking for, in the best condition, with the best service history, and a recent inspection and condition assessment, if possible.

Everyone wants a bargain, and buying equipment in poor condition, cheaply, is often perceived as such. However, there is no escaping the fact that equipment in poor condition tends to be less reliable and less repairable than similar gear in good condition. Equipment in poor condition also doesn’t hold value as well and is less collectible.

Poor condition outside almost always means poor condition inside, and poor maintenance in general. You don’t want sensitive electronics that have not been cared for. Corrosion is a good example. Once corrosion goes through equipment, it can cause endless problems.

Likewise, poorly cared-for gear is usually poorly serviced and maintained, even poorly repaired. Despite the best efforts of skilled repairers later, these issues are usually not reversible.