Looks like a production of South Salem models. More guessing: SS initially produced the model in question, but since it was a typical British ship design, later revised No.13 as a definitely Japanese design, thus the SAN DIEGO MARU, as issued in the set. This is kind of a wild supposition, but changes in models in I.D. sets did happen. Good luck with this one. Please note that the IMF will disavow any knowledge of this occurence!
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No luck trying to snap the funnel off. The area where the funnel should be shows no signs of distress or filing.