Well my PERSONAL fave doesn't even start with P (PAMP, Perth Mint)..... It's Geiger Edelsmetalles "Security Line" bars.
They come in 100g, 250g, 300g, 500g & 1000g/1kg Cast Loaf Bars (SILVER) Heat Sealed in TOUGH plastic with a Certificate sealed in "Behind" the Bar & they come from the same...