This is the newer version of the Osmiroid Easy Change screw in nib. If the word "Osmiroid" is stamped on the clip of your Easy-change pen's cap or if there is a longitudinal slit there (see last image of the four Later Type pens closest to camera) then this is the correct model.
The penultimate images show detail from Osmiroid Star-Flo leaflets. These are for information only and are not included in the sale.
This means that if you haven't also negotiated a similar licence directly with the copyright holder, you are not permitted to use these images.
This applies equally to private individuals as well as corporate entities.