Thanks for the welcome lithograving. As I said, I'm catching up on the thread, up to p.63 now where I found some information on my Chilean
stamps.
On p 63, Nethryk has shown this stamp which I have discussed on another board but it won't hurt to add it here.

Unfortunately, I haven't managed to work out how to link back to a previous image so here is my rather inferior example
of this stamp.
This was not a freighter as Nethryk suggests, but a luxury liner called the Conte Biancamano. I was researching her sister ship, the Conte Grande, when I found the information on this stamp.
Before WWII, both ships were conducting luxury cruises between Italy and various South American ports. When the war started, Conte Grande was in Rio de Janeiro and Conte Biancamano was in Cristobel where she was siezed by US forces. Both were interned as Panama and Brazil both supported the allies.
From then on, their stories are a bit different. For two years, the Conte Grande was used as a floating prisoner
of war camp. The crew did as they were told and were eventually transferred to a camp ashore when the ship was sold to the United States to be used as a troopship and renamed USS Monticello. Conditions in Brazil can't have been too bad because at the end
of the war, many
of the crew chose to settle there rather than return to Italy.
Aboard the Conte Biancamano, the situation was different. The crew considered themselves at war and sabotaged the ship's turbines to stop it being used by the allies. Because
of this, they were considered dangerous and were shipped to high security prison camps in the United States. The turbines were repaired and this ship also was converted to a troop carrier under the name
of USS Hermitage.
At the end
of the war they were given to the Italian government to be used to repatriate Italian prisoners
of war. When this was completed, they were given back to the Italian Line. Both were identical to look at but it is the Conte Biancamano that appears on this stamp from Chile.
http://en.wikipedia.org/wiki/SS_Conte_Biancamano