Based on the photos, it is an original. There were transition phases in which clips already bore a serial number and at the same time the engraving W.-Germany. That the clip optically looks more golden than the Meisterstück ring is typical on the 164 and no counterfeit indication; it can additionally be due to polishing. Against the squeak, the star can be unscrewed; afterwards clip and cap can be removed, and on the underlying black rubber ring as well as the milling of the twist mechanism a little Vaseline can be applied, which generally removes the noise.