Hi
SB Obsession,
Is there any chance you can upload some larger images as it is very hard to see details in these small images.
We may be able to give you the correct advice if they are larger.

The best way of dating a edger with a Briggs engine, is to post the complete string of numbers: (Model, Type and Code) that are stamped into the metal air cowling of the Briggs, from which we can get the date of its manufacture, and model information...this will also help us determine a rough idea of your machines age.