Hesham: there was another seaplane by Koolhoven, if you can't find it on the sites I can search it for you and send it.

Pim: indeed! Now being puzzled if numbers in front of 80PK were sanded away (like other letters missing), or on what very early -max 80HP- plane the prop was used for (see* big prop dimensions.., I could imagine one needs wide 25,5 cm blades for a seaplane to have most pull power at low speed to get out of the water..). Would you know a Koolhoven expert who can recognize this prop? Thx, Hans

*
Gewicht 9 kg; spanwijdte 250 cm; 8 gaten rondom gat van rond 6,5 cm; de kern is rond 18 cm en 10 cm dik; bladbreedte max 25,5 cm.