It looks like this Part has been superseded by LEGO Part 4085c Plate Special 1 x 1 with Clip Vertical [Thick U Clip].
Click on a colored part below to see the Sets and MOCs that use part 4085a Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip] in that color. You can find an overview of all LEGO Colors here.
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There are 5 Mold variations of part 4085a - Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip] in the database, in use between 1980 to 1985. See Molds and other related Parts.