Now it is very easy to make more wheels! Duplicate layer (Ctrl-J), move, rotate, repeat!
 
Patek Philippe Watch - making of - Step 20

For some wheel layers, change layer color from grey to gold.
 
Patek Philippe Watch - making of - Step 21

Instead of plain rectangles, you can use Pen tool to create nice curved shapes and use them in your wheel designs.
 
Patek Philippe Watch - making of - Step 22

We need more metallic mechanisms. In new layer, use Pen tool to create shapes of these mechanisms....
 
Patek Philippe Watch - making of - Step 23

...then apply the same layer effects.
 
Patek Philippe Watch - making of - Step 24

Then, set this blurred layer Opacity to 50%. Already looks mysterious!
 
Patek Philippe Watch - making of - Step 25

Then in new layer, create even more shapes! And apply the same layer effects.
 
Patek Philippe Watch - making of - Step 26

But that's not all! Merge all layers again (Ctrl-Shift-E), then duplicate layer (Ctrl-J) and set its blend mode to Multiply and Opacity to 80%. Perfect!
 
Patek Philippe Watch - making of - Step 27