This would make a great gift for the family member or friend that's a musician or producer.
"CIRCLE OF FIFTHS WATCH The face of the watch shows how many sharps or flats go with each of the 12 major and minor keys. Guide to harmonic progressions and other patterns. This reference tool on your wrist makes it easy to master the circle of fifths and understanding music's grammar. The watch is available in a silver-tone finish or 18K Gold electroplate. 1.25: dial. Shipped from the manufacturer as a special order. Allow 2 weeks for delivery . No express delivery. No returns."
$34.95 at Music Treasures Co.
There's also a Circle Of Fifths clock for $29.95
This would look great in the studio.