was lookin through some scrap finds and found some engraving on this piece. Is 1 inch by 3.5 inch and has 382453 at the one end and three patent dats lined up in the center. Sept. 10, 1840 and August 21 1858 and April 2, 1867. Doesnt look to be cut off from anything bigger, no mounting holes and nothing on the back....any ideas. I tried patent searches but got lots of weird things that this obviously is not. Thanks for lookin and helpin if you can.