Yamaha SX-800A (1976, Walnut Brown)

Does anyone know this type of electric guitar or has come across one? A Japanese friend of mine told me that these guitars are quite rare, even in Japan. Initial production started alongside the Yamaha SG range; The Yamaha SX 800A differs from the more common SX-800B that it sports independent dual coil, high output hum-bucker pick ups and its tonal variety and range is good, varying from soulful and bluesy clear, to a powerful growl. .There are some indications this type was in use by Tommy Bolin with Deep Purple and earlier by Rory Gallagher… For photo’s see: http://www.rorygallagher.com/#/archives/guitars/sx800b  Very Rare guitar, even in Japan.