I recently found this oddity in a huge lot of varied Lego that I purchased and sorted. There are three distinct part numbers for the 3x3 Ball Turret on Bricklink (you can also use #58772
and 58773). You have to select the color white
to see marbled ones for sale.
There are only 1 for sale in the US as of this morning. It's listed as a "rare part," but not particularly expensive (I think around 3 bucks actually).
My question is this: why does it exist, and if nobody knows that, was there one particular set that it was found this way in?
It looks like the part was only available in dark orange
in three sets (2 releases of #4478
and #4767), and was NEVER available in white. So, that would suggest the marbling occurred in the manufacture of the dark orange part, right?