Wolverine made several versions, but I always liked this one in war time grey.  About 13" long.   Key not original but is a #8 clock key,(supplied) which works fine.  Needs a rubber stopper, or cork at the stern to keep out water, but otherwise fully functional.  Foward dive planes adjust, motor works well, prop turns with reduced rate in the water. British naval ensign is an added extra (not original)..Finish has some playwear and scattered paint loss, but is in good overall condition.  Put it in the tub, and play with it..