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leather notepad case with spring close hinge... automatically closes when you let go of cover.

I have been looking for leather notepad case with spring close hinge.
Has anyone seen such and animal or know of a small hinge that could be modded on to a leather notepad case/folder?
I had thought these were called snap-cases but can't find anything like what I am describing above.

The memory I have of my Grandfather's was a spring loaded piano hinge on a leather folder/case for letter size pad.  I would like to find one for a small notepad.

The main point is that it should automatically close.  NOT automatically open.
Thanks!