Number by catalogue:  Yvert: 4296   Scott: 3452  

Perforation: Comb   Perforation type: 12x12

Subject:

80 fens. The big chinese hydraulic wheel for irrigation. Sheeps

Topics: Irrigation and water wheels

Number by catalogue:  Yvert: 4297   Scott: 3453  

Perforation: Comb   Perforation type: 12x12

Subject:

80 fens. The windmill using a strength of wind for pumping out of water polders*

Additional:

*A polder is a low-lying tract of land enclosed by embankments known as dikes, that forms an artificial hydrological entity, meaning it has no connection with outside water other than through man operated devices

Topics: Wind pumps and farm windmill Windmills