There is a small rocket siren ring and this example in white metal has the same size non-adjustable thin metal ring base but the rocket itself is nearly double the size. This rocket is 1-5/8" long and the siren end is 11/16" dia. One side has the inscription as quoted while the opposite side has "Japan." The rocket has six small oval cut-outs on the nose tip, six cut-out porthole windows on the main body and below is a cut-out lightning bolt design. On the tail end is a large whistle siren that blows easily and loudly. Most of the bright silver luster is gone so metal is dark in color but a very impressive and very neat ring. We sold this same exact ring in Auction #161 and this is the only example we've seen.