Vintage 4-lom, carded as Zuckuss shows nice detail for a variation of C3poīs body. Also his head was the most accurate for the period, his grey eyes were an effort of applying different tones of one colour.
another unusual feature was his red nose, wich made vivid the character.
When I was a kid, as I didnīt get any Bantha tracks or similar magazine, I ignored that 4lom was a droid, I thought he was an insectoid, cause the depiction of his head looked a bit kinda organic. (I thought he was an insectoid alien in a C3po armor)
The tlc version, depicted his eyes more metallic like, more droid, in the modern versions we got the rust paintjob, kept also for the tvc release.