The pen shown is indeed the Streamliner (not the Skyline® The Streamilner came in 2 versions and 2 sizes:
98 and 99 and 98L and 99L (The "L's were not guaranteed). There were a umber of colors (black, blue, brown, green and gray - maybe a few more.
The Streamline also came in the grooved plastic cap. Those are far less common. The most rare is the grey with grooved cap.
Do you all have any Streamliners to check and see if yours says SKYLINE? I'm very curious..
I hypothecise that Wahl-Eversharp was up to some funny business, member DCPRITCH check his Streamliner and it too says SKYLINE on the clip band. Now, if the clip bands were the same on both models with the Skyline having the derby part as an add-on of sorts, one could say that WE was just economizing by sharing the clip band.
BUT, that is not the case, the clip bands are clearly different. So I wonder, why call it a Streamliner, but stamp it SKYLINE?
Did they see a need to differentiate the two lines too late into the process such that Streamliners were stuck with clip bands stamped SKYLINE?