This genuine FORTIS tube is designed for use with the Fortis Flieger Chronograph 597-599 models. Made from high-quality steel and manufactured in Switzerland, it is a reliable and durable choice for watch enthusiasts. FORTIS is known for its quality and precision,  Whether you are a professional watchmaker or a hobbyist, this genuine FORTIS tube is an essential component for ensuring that your Fortis Flieger watch runs smoothly and accurately. Please ask for dimensions if necessary prior ordering.