Meticulously penned card by the Swiss composer with "extr[act] of String Quartet (1987/88) ('Cello part, p. 6/III)" written on one hand-drawn staff, a footnote (performing direction) in German, and signed.  Incomplete blank staff (three lines only) to verso.  4 x 6 inches (10.2 x 15.3 cm).  In excellent condition.  

"Lehmann's works are characterized by nuanced shaping of quiet moments.  Many of his compositions were inspired by lyric and ‘concrete’ poetry, strive to motivate a mode of hearing open to confrontation with unfamiliar sounds and processes, and were written for specific performers; this allowed him, especially in chamber works, to develop a flexible rhythmic notation requiring the creative participation of the musicians."  Christoph Steiner in Grove Music Online