This is a classic litem like Master 1525   ,dia combination lock with master key , The key point is how to use it :

 

Turn dial clockwise three or more than three circles ,stopping at the first code. Make sure the code align the mark

Turn dial anticlockwise one full circle and stop at the second code, aligning the mark

Turn dial clockwise and stop at the third code , aligning the mark

Push schacle and open lock 

Have to finish 1-3 steps continuously ,without any turning back when turn.  Otherwise, have to restart from step 1 

Press shacle and close lock

 

Open lock by key

Key align lock cylinder and turn right as possible 

Push schacle and open lock 

 

Turn key back to original place

Press schacle and close lcok 

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