An open hose clamp having a clamping device, i.e., a so-called Oetiker ear. The clamped state is locked by serrated sections which engage with each other outside of the ear section on the side of the ear facing away from the outer clamp strip end. In the locked clamped state, the load on the ear is reduced so the hose clamp does not lose its clamping function even if the outward-protruding ear is damaged. The width of the clamping strip in the area of the ear is reduced compared to the remaining full clamping strip width.