THIS IS AN OLD CHROMED HOOD ORNAMENT APRX 14" LONG, 2 3/4" AT ITS WIDEST AND WEIGHS ABOUT 1 1/2 POUNDS. THE ORNAMENT IS IN THE SHAPE OF A FINNED ROCKET OR MISSILE AND HAS A PLACE FOR 3 MOUNTING SCREWS ON THE BOTTOM. ALSO ON THE BOTTOM IS THE MARK - XO 421. ALSO ON THE BOTTOM ARE 2 MARKS THAT APPEAR TO BE LOGOS - THE FIRST HAVE THE LETTERS - S M - INSIDE A CIRCLE; THE SECOND IS A "LOLLYPOP" SHAPE WITH AT LEAST 3 LETTERS INSIDE.... MAYBE - H (OR M), O AND CO.  I HAVE DRAWN A QUICK SKETCH OF THIS SECOND MARK AND IT IS PICTURED BELOW.  THERE IS SOME MINOR UNDER CHROME RUST BUBBLING FROM AGE BUT OVERALL, CHROME STILL HAS A NICE SHINE.