nice restoration

The para sight isn't original, this type of sight didn't come into existence till the early 60's. It would of had the standard TALL backsight, if you tried to use the para sight with the original front sights you wouldn't be able to hit the side of a barn from the inside. I suspect the original TALL sight was damaged and then replaced with a para sight taken from one of the Argentineicon Para FAL's brought back from the Falklands. Also it looks like your rifle has had a coating of Suncorite at some stage.