Thanks Rob, I agree the early Walther ones like those that came as standard with the LG55 rear sight look the neatest. For me there's a big difference to the sight picture using these diopter sights without any eye cup and with, huge difference so I guess I'm now looking for the Walther one to make the search easier if somebody has one spare ? I was looking for an HW55 one because I saw one advertised on a German website which was showing spares for the HW55 so I thought it might be specific to that gun as it did look different to the one on the Walther.
Remember, it is the strongest character that God gives the most challenges.