LEGO MindStorms Crown Gears - Robot Room

At least three different varieties of the same 24-tooth crown gear were produced by LEGO. Close-up photos of all three. The last gear comes in the LEGO MindStorms robot kits.

LEGO MindStorms Crown Gears - Robot Room

LEGO MindStorms Crown Gears - Robot Room

LEGO MindStorms Crown Gears - Robot Room

FCGear CrownGear - FreeCAD Documentation

Sketch Crown gear in Solidworks

Crown Gears Atlas Gear Company

Crown Race Gears Racing Ring and Pinion Gears

Crown Gears at Rs 500/unit, क्राउन गियर्स in New Delhi