W M ROGERS Serving spoon

This is a large serving spoon (berry spoon?) of some sort that is heavily tarnished (want to find out what it is before cleaning it). On the back is has a bird/eagle mark then W M ROGERS followed by a star stamped on the neck of the spoon. The bowl is rounded  with a groove runing down the center and on each half of the front of the bowl is an engraved botanical picture that looks like a buckeye tree. The back of the bowl is plain. On the handle is a floral pattern with an open area that looks to be where most people would put an engraved initial, but it is blank. According to what I could find about Wm. Rogers he used this mark  between 1825-1841 on his coin silver spoons...but it was also replicated by the International Silver Co. well into the 1930s. Couldn't find a matching pattern anywhere I looked and nothing that had an engraved bowl. Maybe it was a custom piece done by a previous owner? No idea. I am wondering what kind of spoon it is? and what its age is? and if it is coin silver or plated?... purely out of curiosity. Any info about this beautiful piece of history would be greatly appreciated!. Thanks all!!