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Dutch Model K
The Dutch Model K was made of dark green rubber with two large round eyepieces and an exhale valve jutting out to the side. This example was made by Hevea in 1953.
Similar masks in my collection: Italian Tipo Super 53
Rubber stamps
Manufacturer and model stamps on cheek "T.1 18-08 [H] K-53"
Stamp
Stamp inside mask
Stamp
Stamp inside mask "3."
Filter
Filter stamp top view "B-1/55-ZT"
Filter
Filter with plug bottom view
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