1600s Trefid spoon, "BM"? Hallmark

[2into4]

It has a "BM" hallmark I think. I think it's coin silver. I was told it was from late 1600s England. Can someone shed some definitive light on this and it's value?

 

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[dave wiseman]

English silver hallmarks: British maker's marks identification: BM

 

[A2coins]

Great Id chart nice spoon that's a great relic

 

[smokeythecat]

That's a nice piece. Last one I saw was about $200. You should be able to find some on the net with pricing.