The name Tucher (or Ducher) denotes several members of an instrument-making family active in Nuremberg from 1537 to 1632. There were three makers called Hans Tucher, who produced ivory sundials and were among the leading craftsmen of their time. Hans I became master in 1537 and died in 1550. Hans II became master in 1557 and died in 1615. Hans III was born in 1547, became master in 1570, and died in 1632. Their instruments are signed "Ducher."