It looks like this Part has been superseded by LEGO Part 4209b String Reel 2 x 4 x 2 Holder With Open Studs.
Click on a colored part below to see the Sets and MOCs that use part 4209 String Reel 2 x 4 x 2 Holder With Closed Studs in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
There are 2 Mold variations of part 4209 - String Reel 2 x 4 x 2 Holder With Closed Studs in the database, in use between 1981 to 2012. See Molds and other related Parts.