This was my great-great aunt's - so keeping it!  Just trying to identify and get a replacement part - how would this item be described (assume a coffee server)?  It has lock bar (?) - when removed server...

My grandmother had a small antique shop in the 1950's near West Point, and assume this was from her shop but can't be sure. Trying to identify the mark (maker/date?) and any value.  Plate is 12" diameter.