Found a bowl that was silver plate over white metal, soft to bend. Touch mark has "Hard White Metal" under it which could be a tin alloy such as EPBM (Electro Plated Britannia Metal) but could also contain zinc according to Wikipedia.
Anyone have any experience with "Hard White Metal" as a source of tin? I once didn't pick up a bunch of silver plate stamped EPBM only to find out that was over 80% tin. So I decided to take a $1 gamble on this bowl.
I'm going to melt it separate and send a sample in next batch of samples I have to be tested. will post back here what I find out about this label, and the company in the touch mark. Which I have to clean to get a decent picture of.