Weissenborn is a brand of lap slide guitar manufactured by Hermann Weissenborn in Los Angeles in the 1920s and 1930s.These instruments are now highly sought after, and form the base for most non-resonator acoustic lap steel guitars currently produced. It is estimated that fewer than 5000 original instruments were produced, and unknown how many now survive.Both single and twin neck models were produced, both with highly adapted bodies that run the full length of the fingerboards, making conventional playing completely impossible.The brand is now used for reproduction instruments.