Update via Brandon in the comments: "note that this is a special kind of prophet 10, most of them had dual keyboards on them, only very early ones had a single keyboard"
The original Prophet 10 was essentially two Prophet 5s in a Prophet 5 case. It suffered from tuning instabilities due to tempature issues in the small case. A larger cased dual manual keyboard followed to take care of this problem. These shots as Brandon calls out is of the older single model.
note that this is a special kind of prophet 10, most of them had dual keyboards on them, only very early ones had a single keyboard
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