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Comments
They came out in parts packs 518 (2x4 plates), 519 (2x3 plates), 520 (2x2 plates), and 521 (1x2 and 1x1 plates) in continental Europe, and USA/Canada (Samsonite LEGO)... although for some odd reason the 521 plate parts packs sold in USA/Canada were labeled 521/1, while the catalogs only mention 521.
The colors that the plates came out in continental Europe for those 4 parts packs (518-521) was Red, White, Blue, Gray, Clear, Black or (starting in 1964) Yellow. These came out in either Cellulose Acetate (1962-63) or ABS (1963-65).
In USA/Canada the plates came out in Red, White, Gray, Clear, Black and Green, all Cellulose Acetate) from 1963-66 in the 518, 519, 520, and 521/1 packs.
Here is a USA Samsonite catalog page (1963-66) that shows the plate colors (sold in individual colors) as including green....
The USA and Canada parts packs were the same from 1963-66... however the parts count differed for each parts pack. Here's the 1963-66 Canada catalog parts pack page.
And from 1966-68 in Canada (only)... the small green plates were produced in a 481/2 mixed sizes small plates parts pack (multiple size and color plates in this pack, unlike earlier packs).
Images from my Unofficial LEGO Sets/Parts Collectors Guide....
kevin