1) Create a new file, I'm using 400x 200px and white background here.
2) Click on Type Mask (
) then type PLATE
3) Now, create a new later by click on New Layer icon (
), so now you have
2 layer in your layer window (Fig 1).
Remember, you will do the effect in the new layer (layer 1), NOT
in the Background layer or layer 0.
Fig 1
4) Click on Gradient icon (Fig 2)
then choose Gradient : Black, White (fig
3) in the Gradient Options Palette. 
Fig 2
Fig
3
5) Now it's time to fill your TYPE mask selection with the
gradient. Hold down the Shift-key - start 1-2 pixels above the selection,
left-click and drag down until you are 1-2 pixels below the selection.
(fig 4)
Fig 4
6) Then go to Select > Modify > Contract ......
Contract by : 2 px (fig 5)
Fig
5
7) Fill the new selection with the gradient, but it start from below
the selection. Hold down the Shift-key - start 1-2 pixels below the
selection, left-click and drag up until you are 1-2 pixels above the
selection (fig 6) 
Fig 6
8) Now go to Filter > Texture > Grain....Intensity : 23
- Contrast : 36 - Grain type : Enlarge (fig
7)
9) Add Noise by go to Filter > Noise > Add
noise.....Amount : 12, Distribution : gaussian (fig8)
Fig
7 Fig
8
10) Ctrl + D to deselect it, then add a little bit shadow on it. Go to
Layer > Effect > Drop shadow
(fig
9)
11) Your image should now look like : 
Hope it helps :)