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Derby Blades

Can someone tell me why my Derby blades are marked on one side with a 1 and 2 and then a 3 and a 4 on the other side ?
I'm a little new to this

Thanks
 
This is a very common newbie question.

The general consensus is that the numbers are used in the manufacturing process and have no bearing on how we use the blades.

Nick
 
The numbers indicate how the blade should aligned in relation to the earth's magnetic field in order for the blade to achieve maximum sharpness while shaving.
 
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