Creating a document stamp effect

Start by opening an image on which you want to apply document stamp effect.

Using custom shape tool select shape.
Create circular shape in a new layer.

Duplicate the shape layer and press Ctrl+T to transform. Scale it down.
Select path layer and type text on the path.

Select the text path and press Ctrl+T to transform the text path.
Scale it up little bit.
Select line shape tool and increase the weight to 4 pixels.
Create line shape.
Duplicate the layer and place it down.

Type the text between both the lines.