For safeguarding mail and valuables on ships
there was a few inventions. One such device had stamps created for it:
Marine Insurance stamps for Netherlands and Netherlands East Indies, listed as
Scott GY1-GY7
Dutch inventor Cornelis Van Blaaderen (1875-1933) applied for a United States patent Dec. 13, 1913, for a buoyant safe — “drijvende brandkast” in Dutch.
This floating safe was a large steel cylinder affixed to the deck of the ship with clamps that would release if the ship sank, after which flares and audible signals would guide rescuers to the cylinder.
The safes were used only on ships of the Nederland Line, between the Netherlands and the Netherlands East Indies.
A similar service, Simmande Kassaskap (“swimming safe”), was provided by the Swedish Post Office in the Aland Islands, but no stamps were issued.
Only about 600 pieces of mail were transported in the safes from the Netherlands to the Dutch East Indies, and perhaps 450 in the opposite direction. Although a large number of stamps were printed for this purpose, and withdrawn from sale on Sept 1923.
Dutch inventor Cornelis Van Blaaderen (1875-1933) applied for a United States patent Dec. 13, 1913, for a buoyant safe — “drijvende brandkast” in Dutch.
This floating safe was a large steel cylinder affixed to the deck of the ship with clamps that would release if the ship sank, after which flares and audible signals would guide rescuers to the cylinder.
The safes were used only on ships of the Nederland Line, between the Netherlands and the Netherlands East Indies.
A similar service, Simmande Kassaskap (“swimming safe”), was provided by the Swedish Post Office in the Aland Islands, but no stamps were issued.
Only about 600 pieces of mail were transported in the safes from the Netherlands to the Dutch East Indies, and perhaps 450 in the opposite direction. Although a large number of stamps were printed for this purpose, and withdrawn from sale on Sept 1923.
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