I found this bar in the shed, approx 1" x 1/4" across and 20cm long. I had initially thought it was solder but the stamp on it says otherwise. Its volume is 34 cc (measured by water displacement) and mass 336g, giving a density of 9.9g/cc. A mix of 65% lead and 35% tin would have the same density but solder usually has more tin than lead. Both silver and mercury are more dense than 9.9g/cc so I have no real conclusion.
Has anyone ever come across anything similar?