Some boats had them, some boats didn't and then some boats had temporary ones, which were only used in the harbor. Especially the temorary ones are nice to see. They merely 'clamp' on and are removed when the boat went to see.
Usually the tender/harbor kept them, and used them on all boats that came in.
All the museum boats have them, since after the war everyone of them got them, that didn't already have them.
Cod got them after the war.
If you check Navsource carefully, then you can find a lot of info on the photos. You only have to know where to look...
groetjes,
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Gino
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