So the stamps were cancelled by a Genova datestamp. Paquebot Cancellation came into use 1894. The real Paquebot era happened in the first half of the twentieth century. With the growing popularity of air mail and air travel the ship mail slowly declined. But up to today collecting paquebot covers are a fascinated discipline or a handsome addition to any stamp collection.
Every cover is a documentation about ship voyages and routes with an exact date.
Paquebot marks came in a great variety of forms. Sometimes the text 'Paquebot' is handwritten. And sometimes the mark is included by 'thumbnails', see right. The UPU rules doesnt say how to write or mark the word 'Paquebot'. So each port office is free in his presentation.