Fine focus gear developed from brass to last

This image illustrates the original Mamiya RZ67 Pro II fine focus gear in black plastic next to are newly developed gear in brass which is a 1:1 replica

Close-up of vintage mechanical typewriter with exposed gears and mechanisms on a wooden table, highlighting internal components like cogs and wires.
Two small metal gears on a wooden surface, one gold and one black, with a blurred green background.