I have a silver platter that i bought at a yard sale in Utah, and i would like to know what year it was made, how much its worth, and if possible how many were made. The top shows the seal of the state of Utah with floral designs around it, and the bottom is stamped with the following:

(eagle)WM ROGERS (star)
870

if anyone has any info on it I would like to know. Thanks in advanced.