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09PO033_1 A large part of Portals success was due to their ability to produce water marks in their paper, a technique which they invented in 1724. The next 8 pictures are examples of water marks, mostly from Christmas cards sent to employees. This is the one exception, having been done to celebrate the coronation of Queen Elizabeth in 1953 From Frank Smith
09PO033_1
A large part of Portals success was due to their ability to produce water marks in their paper, a technique which they invented in 1724. The next 8 pictures are examples of water marks, mostly from Christmas cards sent to employees. This is the one exception, having been done to celebrate the coronation of Queen Elizabeth in 1953

From Frank Smith
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