There are 2 versions of this pencil—the E500 and then a lesser piece (HAE-250R) that’s included in the 1988 Pilot catalog, page 7.
The lesser model was released in both white and black, and there were 2 versions (different tip designs, probably for automatic reliability). The 1988 catalog version has a silver lead sleeve, but I’ve never seen one of these for sale; instead, I’ve only seen both white and black specimens with black lead sleeves (similar to the E500).
Finally, the E500 does not appear in the 1988 catalog, so I’m not sure when it appeared in the Pilot lineup. But yes, it did come with a cap.