The De Koff organ of the Hervormde Kerk in Hagestein was inaugurated on November 18, 1920. This completely newly built organ replaced an old cabinet organ, which was in poor condition. The soberly designed organ case is beautiful on the organ gallery and in the church.
During the last church restoration, the pine organ case with gallery, along with other parts of the church interior, were repainted in oak imitation. The entire interior has thus become a beautiful visual unity. The De Koff organ was restored in the years 1968-1969 by organ builder A.H. de Graaf from Leusden.
At the beginning of 2021, a plan was drawn up to restore the organ. The Bourdon 16 will return to the manual and the original transmission will be restored. The Octaaf 2 which took the place of the Bourdon 16 will be moved to a newly made side block at the front of the windchest.
In the first week of January 2022, the organ was disassembled and transferred to the workshops in Dordrecht. The restoration of all the parts has started there.