I went to LPM to pick up some of my purchases last Friday, and happened to note two gold ingot were on display. They were salvaged from the SS Central America shipwreck. I did an internet search: the gold ingot and coins were shipped from US western coast to eastern coast New York (through Panama) and was sunken in hurricade at the North Carolina coast in 1857. The golds were salvaged (twice) in 1990s and 2014. These two ingots bear the refinery name (Kellogg & Humbert Assayers) and the weight (oz), the purity, and the then market value (using 1oz = USD20.67).
One bar weights 102.36 oz, that's quite a trunky stuff! For the web search I did, the 100+ oz don't turn up quite often.
The SS Central America wreckage gold is a "famous" one and often offered at auctions or the coin dealership. So they are not that "rare", but it's still an interesting experience to me that I can look at the two bars quitely and took some photos to enjoy.