Star Wars has an unfortunate habit of giving astromechs a four or five digit alphanumeric name and then pretending it’s totally unique, when there’s clearly millions of these droids across the galaxy. There’s no way they all have unique designations that short.

Seems odd to me that with the staggering scale of the manufacturing capabilities available to them (see clone wars), wouldn’t any droid producer be manufacturing them on a large scale, rather than with custom 1-off paint schemes?