The following description is taken from the 1969 Fender lovin' care catalogue
Changing moods - heavy to delicate to rich and smooth; that's the Fender Electric 12-string. Fender has built unmatched versatility into the 12-string to correspond to full needs of musicians.
The first two pair of strings are tuned in unison and the remaining four pairs in octaves. Two wide range split pickups are designed to give maximum effectiveness of the 12 strings. A four way tone selector switch allows the player to select either of the two pickups, both or a separate wide range effect. In addition, a tone control placed immediately below the volume control enables sound flexibility.
Twelve individual barrel type bridges, carefully graduated in size to follow the contour of the fingerboard are adjustable for length. The entire bridge channel may be raised or lowered at either end of the channel. \the slim neck of the 12-string contains an adjustable truss-rod which maintains perfect alignment. It has 21 frets and may be ordered with a size narrower or a size wider than standard width at the nut. It is bound and has inlaid position markers for easier fretting and added beauty. The "off-set" waist body design is another Fender first. This unique design places the player's arm in a natural position over the strings.
The 12-string features the finest workmanship and components, and all metal parts subject to wear are case hardened and heavily plated to retain their beauty even after long use. It is finished in shaded Sunburst or may be ordered in selected custom finishes. Left-hand models available by special order.