Used, fully functional German-made machine heads for a wooden bass (contrabass). These are products (No. 140-100) from RUBNER, a specialized machine head manufacturer in Germany. They are apparently high-quality machine heads installed on various wooden basses (contrabasses) both domestically and internationally. Please understand that the authenticity is unknown, and there is no specific manufacturer name, so only those who understand this are welcome. Price is negotiable! There are two for sale here, but there are about four in total in stock.