Looks terrible

Agree to disagree, I think it's fun and whimsical. People take their cars too seriously nowadays.

Not even just rare, but each color combination is unique

There are websites who track their current known status

Used to do track days and car meets a lot (pre-cars and coffee stuff)... I've seen a few of these, always crazy to see them as a lot of people had no clue what they were.

I think the name Harlequin was a US thing? I remember them being called Color Concept in Europe, available on Golf and the Polo, from what I recall.

A few years ago i saw one fairly often in Santa Cruz, CA. I bet it's still there puttering around

To see a sewer explosion up close is super rare, consider yourself lucky! 😁

BTW the harlekin costume is ugly AF IMO.