The Yamaha SA20 and SA20B
According to the archives on both these models, production started in October 1968 and ended in 1972. The B is the Pearl
tone finish model along with the 50B and 70B
This is the 12 string model in the early SA stable.
Specifications
Body Maple* with a high Gloss Polyurethane finish Celluloid (Ivoroid) binding with 2 similarly bound F holes
Neck Maple Glued in Matching on the Red and Green Black on the Sunburst
Fretboard Rosewood 22 Frets with a zero fret block markers 630mm scale 13.75" radius
Headstock Yamaha written on Aluminium Truss Rod cover with Tuning Fork logo
Tuners 12 Yamaha Open High Ratio
Pickups 2 Hum Free Yamaha Anisotrophic Ferrite with fully adjustable pole pieces
Controls 1 Volume 1 Tone 1 Blender and a 3 way
Nut 42mms
Hardware Chrome
Bridge Roller type strings individually height adjustable and bridge adjustable trapeze tailpiece
Pickguard Small black 5 ply.
Colours Sunburst Aruba Green or Cherry Red see below for the B
Years available 1968 to 1972
Weight 3.8 kgs
According to the archives the B Pearl Tone finishes came in Pearl Sunflower, Pearl Camellia, Pearl Marine, Pearl Glacier
Pearl shadow has also been mentioned elsewhere.
The bit of bare wood in the tailpiece is typical of most early SAs except the 15 and 15D