I love the old British peep sights, made by Parker Hale and BSA but what really gets me going are the 1950s German diopters, made by Falke, Weihrauch and BSF. They are real works of art, machined solid steel, without the alloy of the later Diana/Anschutz/Weihrauch equivalents. I can't help but collect these early sights, along with the corresponding rifles.