This term refers to a specific set of build specifications or desired qualities pertaining to a particular instrument. The phrase describes a configuration that is no longer in production or readily available through standard channels. For instance, a guitar with a unique combination of features, such as a particular neck profile, finish color, and hardware, might be considered as meeting this description if that combination is no longer offered by the manufacturer.
The significance lies in the pursuit of these discontinued configurations by musicians and collectors. These individuals often seek out these characteristics for their perceived tonal qualities, aesthetic appeal, or historical relevance. Acquiring such an instrument can provide access to a sound or feel that is no longer obtainable through current production models, contributing to a unique playing experience and potentially increasing its value on the vintage market.