Is it ok to copy a W5 head and make it better or are we just mad at Speedmaster

FWIW, I doubt they would have had a patent and if they did, they normally only have a 20 year lifespan and only in the countries where they were originally registered. More likely that they were subject to a Registered Design which precludes making an exact copy but does not limit improvements, changes & refinement. Regardless, patents are meant to be rendered obsolete by new innovation (which btw is something the Chinese are not at all good at)! Just wanted to highlight some of the finer points of intellectual property (IP) management and certainly with no intent to make life easier for those that copy and cheat to undermine innovative design and engineering!