Spring bar with double shoulder and slim diameter of 1.30 mm, ideal for use in watches with narrow lugs or limited space in the strap mount. The double shoulder makes it easier to handle and install the spring using tools, which provides better control and reduces the risk of damage during assembly.

This type differs from flanged variants in that the shoulders do not protrude in the same way, but provide a clear attachment for tools - especially useful for service and strap changes. The Ø1.30mm variant is often used in vintage watches or models with thinner strap mounts where precision and discretion are important.