This nice polished stainless steel hubcap has a small raised cone in the center. It is very similar to the original style found on some vintage Serro Scotty trailers with nubs on the wheels.
Please measure your wheels prior to ordering. Many wheels with nubs will not fit these caps...they are for wheels with a nub diameter of about 10-1/2" only.
These were the original style hubcaps used on 1964 Airstream Bambi Ii 14" wheels.