Help to Identify Flatware Hallmark I Cant find to save my life

I am in need of help identifying the hallmark on a set of flatware I acquired. I have spent hours looking at pictures. I have no idea when, where, or what metal they are made of. They are all non magnetic. Thank you for any help.

I don’t think these are silver since there appear to be no actual silver hallmarks (the one you display is not any of the ones I’m familiar with). Is it possible these are made of pewter?