This rare and unusual piece appears to be some type of spreader. I spent hours trying to identify the pattern and purpose without success, but it may be a spreader for something like mustard, or jam. The application end has a buttocks shape and the handle has an embossed floral repousse pattern. There is a tab on the back to support it off the table. It is marked Wm Rogers (star) 2.
The silver plate is in great vintage condition with one minor spot of wear on the back neat the end of the handle. It measures 6 1/8 in. long x 5/8 in. wide on the end.