Bruckmann Silver or Silverplate?

My aunt left me some silver serving spoons which I have identified as Bruckmann by the locomotive hallmark. It is a fiddle head design with hallmarks of “B” , the locomotive, and “20”.

Since it doesn’t have the usual “800” hallmark, I suspect it is silverplate??? :question:
Here are the hallmarks:[/img]
Bruckmann 2.jpg
Bruckmann 1.jpg