As I said in the first post ignore the lightning bolt. I am using that pic for the W only.  If your W is upside down It is more then likely the cheap knock offs from India. It will have almost no bracing underneath. I have seen a pair of each in real life and the original Williams have full bracing on them and the others that were made in India  after the License was sold off have almost none and the W was embossed upside down.