It looks like this Part has been superseded by LEGO Part 6542b Technic Gear 16 Tooth with Clutch [Smooth].
Click on a colored part below to see the Sets and MOCs that use part 6542a Technic Gear 16 Tooth with Clutch [Toothed] 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 3 Mold variations of part 6542a - Technic Gear 16 Tooth with Clutch [Toothed] in the database, in use between 1993 to 2014. See Molds and other related Parts.