Shipmate 17, when you say the model is 'heavy metal' I assume you are simply describing the substance it's made of: a metal that is heavy. (Looks like pewter.) Heavy metal in the radioactive/toxic sense would be appropriate for a nuclear-powered ship, but not for a household object. In the musical sense it might be the preference of the carrier's crew, but the object is a cigarette-lighter, not a music-box.
I had a guided tour of the USS Enterprise in 1969, at anchor in Singapore roads, and I think my pic from that trip was among my first SN posts. I was shown places in the bowels of the vast ship where, I was told in hushed tones by my matelot guide, officers would not penetrate except in pairs or groups.