It was valued at over ƒ5,500 The mill was owned by Heerke Reinders Heerkens and was sold to Hendrik Gerrits van der Meulen.

He died in 1833 and the mill passed to his widow Durkje Reinders Visser.

She sold the mill in 1839 for ƒ6,064 to Harman van der Sluis Meines of Bakhuizen.

In 1859, the mill was owned by P L van der Wal, who advertised for an miller's assistant in the Leeuwarden Courant that year.

Owner Sipke Voskuil offered the mill for sale in the Leeuwarden Courant of 20 October 1871.

[5] In 1986, it was decided to move 't Op to Koudum as the mill was surrounded by industrial buildings.

The roundhouse, buck and roof of the mill are covered in boards and tarred.

The great spur wheel drives a pair of 1.30 metres (4 ft 3 in) diameter Cullen millstones via lantern pinion stone nut which has 18 staves.