## Master Key Chromatic Pitch Instrument
This is a Master Key chromatic pitch instrument, model A-440. This device appears to be a vintage tuning aid, likely used by musicians to accurately set the pitch of their instruments. The instrument features thirteen keys, each corresponding to a specific pitch, and is constructed from metal with a circular design.
## Condition & Collectibility
The instrument presents with signs consistent with age and use. The metal shows patina and wear, and the instrument’s functionality is not assessed. This piece would be of interest to collectors of vintage musical instruments, tuning devices, or those interested in the history of music technology.
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