I guess one could say that it was shear luck that you got them at a bargain price. (Couldn't resist the pun)
Blade sharpening is an art form in and of itself. Whether it be knives, scissors, shears, or a variety of garden tools, etc. Has to be good quality steel of course, not the cheap Chinese junk that is abundant these days. Restoring older tools of any type is a fascinating hobby, and I have watched many youtube videos about it. Any plans on making a video of the restoration process in the future, and posting it on YouTube?
As a side note:
Reminds me that we have some tools in the shed that need attention... as well as the mower blades on the tractor.