Hallmark: "castle", "W", "crown&quo continued...

[Rick Carbone]

I just picked up this piece from an estate sale. Not sure if it's a butter dish or what at this point. Might be a little big for that though. Measures 7 3/4"x5 3/4"x3 1/2" Anyway, to the point of the post. I saw the earlier post regarding these hallmarks, but no definite answer. If there's another post, please direct me. Please see the pics for more detail. Thanks in advance.