And the final post of collectibles from the "S" box leading off with Silver Diamond Corporation. According to Chris on AllEngelhard.com, 1,000 of these were produced in 1972 for Einar C. Erickson and his Silver Diamond Corporation of Las Vegas, NV, by Elgelhard.
SBC and SSS, two ingots with no other information than the hallmarks. I have seen guesses at the names suggesting Southern Bullion Corporation and Southern States Silver but have yet to find anything credible.
The "S" list to follow.