Sugar Spoon - help identifying

I have a sugar spoon that I an trying to identify. I have included multiple pictures entire piece, markings, and pattern. The spoon is approx. 5 3/4" long and has a scalloped spoon cup. The spoon cup is approx.1 3/8" wide. The markings are: “Sterling Plate” and a lozenge mark with what appears to be the number “3” inside - or it could be a “B”.

Any information would be appreciated!
Thank you in advance!
Kelly
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Still haven’t identified - any ideas or suggestions??